Upgrade to High Sierra failed and I cannot restore backups from macOS Server
I ended up calling Apple support and they apparently don't know to restore a Time Machine backup from a Time Machine server either. So I took matters into my own hand:


Copied sparesebundle from TM server to USB drive.
Attached USB drive directly to MacBook Air.
Mounted sparsebundle and started Migration Assistant.
Restore the data.


At first I tried to restore without mounting the sparsebundle and wile the computer name from the backup file will show, no backups show. You must mount the sparsebundle.