i have the sign-in issue with the itunes on my old iMac after reinstall macos Catalina

After a complete ssd erase in my iMac late 2012, i re-installed macos Catalina on it, signed-in in iCloud with no issues, i faced the problem that itunes do not accept my login and password and also i can’t authorise the iMac. And i can’t take off the check from Photos in iCloud and fully sign-out there.