note that not all enterprise setups use enterprise managed accounts.
you can also use GHE with unmanaged accounts that are still connected via SSO for approving access.
using enterprise managed accounts and unmanaged accounts on the same system can be quite annoying because you'll need to use different browser contexts (container tabs, separate browsers, etc.) and also different hostnames for ssh cloning to use different ssh keys.
https://docs.github.com/en/enterprise-cloud@latest/admin/ide...
https://docs.github.com/en/enterprise-cloud@latest/admin/ide...