Gmail acc for kids on emclient

Hi there, I’m trying to set account on em client for my kid. I did everything what was requested.
Now I can send mails, but cannot preview anything what was send or received.
No mails.
Have a question - may it be connected with Parental protection?
Just to add, same issue popping up with outlook.
Is there any chance to omit this?
Thanks for any advices.

Might be due to gmail account limitations
https://support.google.com/mail/thread/203563805/managed-child-account-app-passwords-forwarding-and-pop-imap?hl=en