MCP returns an authentication challenge when the saved Institution session is confirmed no longer valid. The assistant may then ask you to reconnect or reauthorize Institution.
Use the assistant’s connection flow to sign in again and review the company and access. Complete authenticator verification when required. Do not paste a dashboard session token into the assistant to repair the connection manually.
A fresh sign-in at the permission portal can renew active connections while their OAuth credentials remain valid. The portal reports when existing connections have been renewed without changing their companies, permissions, or expiry choices.
Temporary outages, rate limits, and unclassified upstream errors are different from confirmed invalid authentication and can remain retryable. Read the actual error before revoking and recreating every connection. If the issue persists, provide support with the assistant name, company, operation, and safe error wording. Avoid sending access tokens, refresh tokens, or session cookies as diagnostic material.
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