I want to backup my SQL Server DB with Azure Recovery Services. I'm creating a backup with type "SQL Server in Azure VM (Preview)" and check the respective VMs for discovery. As expected, the "UserErrorSQLNoSysadminMembership" error occurs, because the SQL Server DB is installed manually after VM deployment, so it's not a preconfigured Azure SQL Server VM, but a Windows VM with SQL Server installation.
After discovering the VMs with Windows 2016 and SQL Server 2014/2016, I added DB login for "NT SERVICE\AzureWLBackupPluginSvc" user and gave it sysadmin server role as per documentation. Then I'm running "Rediscover DBs", but I'm still getting the "UserErrorSQLNoSysadminMembership" error. I also tried with restarting all services and also restarting the VMs, same result.
Any clue?