We have an automated flow which has "Send Email V2" action, now the action suddenly start raising this error:-
Error from token exchange: Runtime call was blocked because connection has error status: Enabled| Error, and office365 is in the block list. Connection errors: [ParameterName: token, Error: Code: Unauthorized, Message: 'Failed to refresh access token for service: aadcertificate. Correlation Id=ab2617a7-fd03-489f-a79a-640722c52b68, UTC TimeStamp=1/19/2024 1:16:50 PM, Error: Failed to acquire token from AAD: {"error":"invalid_grant","error_description":"AADSTS50173: The provided grant has expired due to it being revoked, a fresh auth token is needed. The user might have changed or reset their password. The grant was issued on '2023-11-15T11:07:27.6344894Z' and the TokensValidFrom date (before which tokens are not valid) for this user is '2024-01-12T15:08:46.0000000Z'. Trace ID: 8063b1c6-1d35-4681-8bb5-a4195a652300 Correlation ID: e3e7ef06-bee3-4697-bc7d-50d91a8b6772 Timestamp: 2024-01-19 13:16:50Z","error_codes":[50173],"timestamp":"2024-01-19 13:16:50Z","trace_id":"8063b1c6-1d35-4681-8bb5-a4195a652300","correlation_id":"e3e7ef06-bee3-4697-bc7d-50d91a8b6772","error_uri":"https://login.windows.net/error?code=50173"}']`
while i can send an email using the user account from outlook, and the connection inside power platform is not showing any error:-

so what could be causing this error?
Thanks