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Passwordless code not getting emailed to user

Anyone else having issue with the Passwordless Code emails not getting sent to the user? We are suddenly having issues in all of our tenants for all users. When I check the Auth0 log I get an error that says “Failed Sending Notification” and “Invalid login: 535 Incorrect authentication data”.

It sounds as if the mail provider configuration might have a problem, and so Auth0 can’t connect to the SMTP service.
Check the configuration, including API keys/username/passwords, and try the configuration using the “Test” button directly.