Anyone facing this problem? (email domain)

[MyIDKaTePe]

Subdomain or in cyberpanel we named it with domain.

Email:
anything@sub.domain.tld

1. DKIM problem —> cannot generate domain dkim
2. cannot create forwarder email@subdomain.domain.tld
3. cannot delete email anything@sub.domain.tld
   3.a i try to remove from phpmyadmin