Overview
This error indicates that something failed in the OAuth 2.0 authentication process before or during the token exchange. The problem can be related to local configuration, network issues, or unexpected server responses. It prevents the system from completing the OAuth 2.0 authentication cycle.
Event examples
See some examples of the OAuth2 progression failed Event messages:
- Task "Monthly Invoices" Action "Send Email" error: unexpected OAuth 2.0 response ◽ Non-JSON-response · CI6ImltaTBZMnowZFlLeEJ0dEF…
- Action "Send Email" error: could not read registry (Settings\OAuth2\319EE0D0-08F4-42D8-88FA-E2762EE30E4B) The system cannot find the file specified. [os:2]. Undefined error. [os:0]
- Send Email error: could not load credential (MS OAuth).
- Send Email error: OAuth 2.0 request error (04 Net error. Unable to connect to the remote server).
- Send Email error: OAuth 2.0 request error (04 Net error. The remote name could not be resolved: 'auth.example.com').
- Unexpected OAuth 2.0 response ◽ token_type · Bearer.
- ◾ scope · https://outlook.office.com/IMAP.AccessAsUser.All https://outlook.office.com/SMTP.Send https://outlook.office.com/User.Read.
- ◾ id_token · eyJ0eXAiOi…
- ◾ expires_in · 4860.
- ◾ ext_expires_in · 4860.
- ◾ refresh_token · 1.AUEBsxFn…
Cause
There are several potential causes:
- Missing or deleted credential configuration (e.g., Registry keys or values not found).
- Network connectivity issues (e.g., DNS resolution failed, no response from the auth server).
- A non-OAuth-compatible SMTP server was used.
Solution
Read any additional information accompanying the error event to figure out the failure cause.
- Re-create the credential if it appears to be missing or corrupted.
- Check that all server addresses are spelled correctly. Verify network connectivity.
- Confirm the authorization and token URLs are correct for the provider.
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