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Claude for Excel Extension - "Couldn't start sign-in" Error - Pro Subscription #1645

@bahodurusmonov

Description

@bahodurusmonov

PROBLEM:
Cannot sign into Claude for Excel extension.
Error: "Couldn't start sign-in. Please try again."

IMPORTANT DETAILS:
✓ Subscription: PRO (Active)
✓ Device: Windows 11 + Excel 2021
✓ Browser: Chrome/Edge/Firefox
✓ claude.ai: Works perfectly
✓ Excel extension: Fails completely

TROUBLESHOOTING COMPLETED:
✓ Cleared cache, cookies, socket files
✓ Disabled other extensions
✓ Tried multiple browsers and devices
✓ Signed out completely from claude.ai
✓ Tried Incognito/Private mode
✓ Uninstalled and reinstalled extension
✓ Restarted computer multiple times
✓ Verified same email on both accounts
✓ No organizational restrictions

ATTEMPTS TO RESOLVE:
✓ Fin AI bot: No resolution
✓ Help Center troubleshooting: No solution
✓ Support ticket submitted: Awaiting response (ID: 215474566329072)
✓ All documented solutions: Failed

QUESTION:
Has anyone experienced this issue?
Is there a known workaround or solution?
Could this be a server-side issue?

Any help appreciated!

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