I get the error
Cannot open database "" requested by the login. The login failed. Login failed for user ''.
I get the error
Cannot open database "" requested by the login. The login failed. Login failed for user ''.
Please make sure you set "Allow access to Azure services" to ON on the firewall configuration of your Azure SQL Database.
Please take in consideration, that Azure AD admin sign in doesn't work with accounts that have 2-factor authentication enabled. In addition, Query editor doesn't support connecting to the master database.