HELP - Not receiving Trusted Device email

Hi all,

I am having trouble with receiving the email to add my device to Trusted Devices.

It DOES WORK for @gmail.com email, but not for my custom domain email (example: admin@petekemp.com) - using GSuite to manage my emails.

I have contacted GSuite support and everything seems perfectly OK with my MX records and my email account, so it must be a problem on TeamViewer's end when sending to certain domain names?

Note: I can't set up 2 Factor Authentication as I can't log in to the account on any device.
Note: I have also checked all spam / trash / filters and it's not being blocked on my end at all, the emails to reset password/add trusted device just don't come through to the custom domain GSuite email.

Thanks!