Gen4 family is not available in this region. Microsoft SQL Server, Error: 45122

This post describes how to fix the error 'Gen4 family is not available in this region. Microsoft SQL Server, Error: 45122'

Cause

This error can occur when creating a new database in Azure using SQL Server Management Studio.

If you select the Configure SLO page, you will see GP_Gen4_1 as the Current Service Level Objective.  This setting is greyed out if you are not signed in to Microsoft Azure:

Resolution

When you are signed in, these Azure options can be changed.  I changed the Edition to Basic, which also changed the Current Service Level Objective to Basic:

This enabled me to successfully create the database, however this may vary depending on your region.