Refer to Creating Azure endpoint documentation:
Check the errors in vRA logs and vRO logs as well for better symptoms of the issue.
To create Log bundle for vRA:
Log in to the vRealize Appliance with user name root and the password you specified when deploying the appliance.
Click vRA Settings.
Click the Cluster tab.The Distributed Deployment Information table displays a list of nodes for the distributed deployment.
Click Collect Logs.Log files for each node are collected and copied to a zip file.
To create Log bundle for vRO:
Login to the vRO server configuration page.
And go to Export Log, to create log bundle.
I've had a SR open for some time now, it turns out the Azure plugin is not compatible with Azure Germany. I am waiting for a new version now.