The customer set up Sendgrid as their SMTP provider and found they were not receiving passwordless emails. They had “Failed Notification” (type: fn) entries in their tenant logs with the following error description:
The from address does not match a verified Sender Identity. Mail cannot be sent until this error is resolved. Visit https://sendgrid.com/docs/for-developers/sending-email/sender-identity/ to see the Sender Identity requirements
In the Email passwordless connection settings, the ‘From’ email was set to <firstname.lastname@example.org>.
Navigate to Dashboard > Authentication > Passwordless, click on Email and add an email address that is registered as a Sender Identity with Sendgrid in the ‘From’ field.