I set the SSO Domain years ago to the same domain as my active directory domain. This conflict means I cannot enable active directory as a identity source.
Any way of changing the SSO domain back to vsphere.local or something else post deployment?
This procedure should help you:
I think he meant he named sso domain same as AD, so this will break the identity source - There is a way, its a bit tricky but I have done it myself a few times, step by step guide here, but check the vmware docs as well https://virtualtassie.com/2018/vcenter-6-7-cross-sso-domain-repointing/