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The 2026-08-03 follow-up's "restart Claude Code" step was falsified same day by a full machine reboot that left Internal_CompanyNotFound unchanged. Records the two theories ruled out with evidence (stale bridge process; MCP config/company misconfiguration, both screenshot-verified) and states plainly that this is a client-unfixable, likely BC/SaaS-side condition requiring Microsoft support escalation.
98 lines
4.8 KiB
Markdown
98 lines
4.8 KiB
Markdown
---
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bc-version: [all]
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domain: mcp
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keywords: [businesscentral, mcp, bc-mcp-bridge, company, header, display-name, config, troubleshooting]
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technologies: [al, mcp]
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countries: [w1]
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application-area: [all]
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---
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# BC MCP `Company` Header Must Be the Exact `Navn` Field, Not `Vist navn`
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## Description
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`~/.bc-mcp.config.json`'s `company` value is sent as the literal `Company`
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HTTP header to the BC MCP endpoint. It must exactly match the company's
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**`Navn`** field in Business Central's company list — not the **`Vist navn`**
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(display name) field. The two are often different strings for the same
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company, and BC's own company picker UI shows the display name more
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prominently, making it the natural (wrong) one to copy.
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## Incident (2026-07-31)
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CURABIS's own `businesscentral` MCP server failed after "working all
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evening" with a generic client-side "connection timed out after 30000ms" —
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no useful error surfaced to the developer. Root cause: `company` was set to
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`"CURABIS ApS"` (the `Vist navn`), while BC's actual `Navn` field is
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`"Curabis ApS"`. BC's own API rejected the mismatched header with a fast,
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clear 400 error — but `bc-mcp-bridge.js` had a separate bug
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(`bc-mcp-bridge-must-surface-non-2xx-responses-before-sse-parsing`, same
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incident) that swallowed the error body, turning a sub-200ms server error
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into a 30-second client-side hang with no diagnostic.
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## Verification
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If `businesscentral` MCP fails, check BC's company list page (Virksomheder /
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Companies) and compare the `Navn` column — not `Vist navn` — against
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`~/.bc-mcp.config.json`'s `company` value, character for character. Do not
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assume the value that "looks right" from the picker UI is the one the API
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needs.
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## Anti-Pattern
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// WRONG: copied from BC's company switcher, which shows Vist navn
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{ "company": "CURABIS ApS" }
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## Compliant
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// CORRECT: copied from the Navn column on the company list page
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{ "company": "Curabis ApS" }
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## Scope
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Every machine with `~/.bc-mcp.config.json` configured — this is a
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machine-local file, not something Mode B can fix centrally. The template
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(`bc-mcp.config.template.json`) carries an explicit warning about this
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distinction as of 2026-07-31, but a machine already onboarded before that
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date needs its existing file checked manually.
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## Follow-up (2026-08-03) — a correct header does not guarantee the request resolves
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The `Internal_CompanyNotFound` symptom recurred on 2026-08-03 on two
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independent developer machines, both with `company` already set to the
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correct `Navn` value (`"Curabis ApS"`) per this rule. The header-mismatch
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cause above was confirmed absent both times — yet the error still occurred,
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intermittently, within the same working day.
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This means a correct `Navn`-matching header is **necessary but not
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sufficient**: the same-looking error can have a second cause unrelated to
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the header value. When this happens, the header-match check (Verification,
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above) has nothing left to find — do not keep re-checking that same field.
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**Ruled out on 2026-08-03, with evidence — do not re-investigate these:**
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- **Stale client process.** A theory that a long-running `bc-mcp-bridge.js`
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process was running pre-fix code from before its 2026-08-01 update, and
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that restarting Claude Code would pick up the fix. **Falsified same day:**
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a full machine reboot (strictly stronger than a Claude Code restart — kills
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every process, clears all in-memory state, re-establishes every network
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connection) left the exact same error unchanged immediately after. An
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earlier apparent "it works after a restart" observation was very likely
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coincidental with an intermittent server-side state, not causal.
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- **MCP Server Configuration misconfigured.** Verified via BC UI screenshot:
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`CURABIS_DEV` configuration is `Aktiv` (Active) = on, `Standard` (Default)
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= on, with the expected tool set and permissions present.
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- **Company record wrong or `Navn` mismatched.** Verified via BC UI
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screenshot of the company list: `Navn` = `Curabis ApS` exactly (matches
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config character-for-character), `Vist navn` = `CURABIS ApS` (confirming
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why the original 2026-07-31 mix-up was easy to make), setup status
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`Completed`.
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**Conclusion:** with the header confirmed correct, the MCP configuration
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confirmed active/default, and the company record confirmed correct — all
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via direct BC UI inspection, not inference — and the error still recurring
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intermittently, immune even to a full machine reboot, this is not a client-
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fixable condition. Escalate to Microsoft support with the evidence bundle
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(exact error text, `~/.bc-mcp.config.json` values, both BC UI screenshots,
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and timestamps of both failing and working calls) rather than continuing
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local troubleshooting. Root cause of the intermittent failure itself remains
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unconfirmed — likely a BC/SaaS-side condition outside CURABIS's visibility.
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