Updating the cluster functional level failed because the cluster is running in fix quorum mode. Start additional nodes which ...

Updating the cluster functional level failed because the cluster is running in fix quorum mode.
Start additional nodes which are members of the cluster until the cluster reaches quorum and the cluster will automatically
switch out of fix quorum mode, or stop and restart the cluster without the FixQuorum switch. Once the cluster is out
of fix quorum mode retry the Update-ClusterFunctionalLevel PowerShell cmdlet to update the cluster functional level.