SOLVED: How To Deregister A Server Endpoint From Azure Storage Sync

If you are using Azure Storage Sync and want to remove a on-premises server you may be tempted to just DELETE it from the the SYNC GROUP, but that will not do the trick.

If you want to deregister / unregister an on-prem server from Azure Storage Sync you have to:

1. Go into STORAGE SYNC SERVICES
2. Click on the Sync Service in question
3. Click REGISTERED SERVERS
4. Click on the server you want to remove
5. Click UNREGISTER SERVER
6. Type in the (copy / paste) the name of the server in the confirmation box at the bottom