Q:

Azure SQL database copy with active replica

I am experiencing an issue when making a copy of our Azure SQL Database.  The database that we are copying has an online replica as part of Geo-Replication that's available and configured through the Azure Portal. 
We make a copy of the primary data onto a different server using the Azure Portal copy button, but our database copy still thinks its part of a replica set. 
For example, I run the following SQL:
ALTER DATABASE <DatabaseName> SET SINGLE_USER WITH ROLLBACK IMMEDIATE
The response I get is:

The operation cannot be performed on database "" because it is involved in a database mirroring session or an availability group.  Some operations are not allowed on a database that is participating in a database mirroring session or in an availability group. 
  Msg 5069, Level 16, State 1, Line 1
  ALTER DATABASE statement failed. 

I have tried to run:
ALTER DATABASE <DatabaseName> SET PARTNER OFF; 

This is not supported as part of azure-sql so I get a response of:

Keyword or statement option 'PARTNER' is not supported in this version of SQL Server. 

The Azure portal for the database copy says that "Geo-Replication is not configured"
Can anyone point me in the right direction of how to tell the database copy it no longer part of any replication? 

A:

Adding to Conor answer, you can also try to export the database as a bacpac and then import it as a new database.  Here you will find how to export the database to an Azure storage account.