I made Enterprise Account with my personal Email,
And Salesforce Appexchange Package is Installed well,
I also Authorized custom app with all the way of authentication (JWT and others)
Service Account is created well,
BUT, when I tried to log in Admin or other user account on Salesforce Org, then I got error message like "You may not log in with an enterprise that does not match the service account. AccountId for User 1250805553 AccountId for Service Account null".
How Could I solve this problem?