I am not getting the pincode email with fresh setup for a subdomain block

What is the name of the domain?

photonmed.eu

What is the error number?

No error number

What is the error message?

No error message

What is the issue you’re encountering

I am not getting the pincode email with fresh setup for a subdomain block.

What steps have you taken to resolve the issue?

Tested multiple emails including gmail.

Screenshot of the error