Make errors / Auth
AccountValidationError: Failed to verify connection. access_denied
Cause
The generic HTTP OAuth 2.0 module's token handling does not satisfy a specific API's authorization-code or refresh-token requirements, so the connection looks valid but fails at runtime.
Fix
Switch from the generic HTTP OAuth module to the service's dedicated Make app if one exists. For a custom HTTP connection, inspect request/response headers with the Make DevTool to find the failing OAuth step. Ensure token refresh is configured and the auth code is not reused after expiry.
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