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Internal_CompanyNotFound recurred 2026-08-03 on two machines with the company header already matching Navn correctly, ruling out the original header-mismatch cause. Failure was intermittent and appeared to clear after restarting Claude Code, suggesting a separate, still-unconfirmed session/ bridge staleness issue. Adds a follow-up section with next steps so future sessions don't re-verify an already-correct header a third time.
86 lines
3.9 KiB
Markdown
86 lines
3.9 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. Restarting Claude Code (which
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respawns the `bc-mcp-bridge.js` process and re-establishes the MCP session)
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was observed to restore working state, though this has not been root-caused.
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This means a correct `Navn`-matching header is **necessary but not proven
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sufficient**: the same-looking error can have a second, distinct cause tied
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to the long-running bridge/session rather than a static config value. A
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developer who has already verified the header matches `Navn` character for
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character should not keep re-checking that same field. Next steps, in order:
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1. Restart Claude Code once and retry.
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2. If it recurs, check BC-side state that a config file can't reveal: the
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Entra app registration's (`BC_DevelopmentMCP`) company-permission
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assignment, and whether the relevant MCP Server Configuration
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(`Model Context Protocol (MCP) Server Configurations`, BC page 8351) is
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still Active.
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3. If it recurs across restarts and BC-side checks pass, treat it as a
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SaaS-side incident and escalate to Microsoft support rather than
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re-diagnosing the client config a third time.
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Root cause of the session/restart-correlated failure mode is still open —
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this section records the observed correlation, not a confirmed mechanism.
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