I need to replace my old admin login/user with a new one. I tried the following:
CREATE LOGIN newDbAdmin WITH password=\'123isTheBestPasswordEver\'
CREATE USER n
You can use Azure AD to manage the server. Create a DBA group - assign all DBAs to that group. Then assign the group as the AD Manager for the server - that allows you to have multiple DBAs
Anyone in that group will have full DBA permission over the server.
https://docs.microsoft.com/en-gb/azure/sql-database/sql-database-aad-authentication
Ideally, I think they expect you to use DB level contained users granted by a DBA. For us, we needed multiple admins as we have a lot of databases.