Reassigning Personal WVD

iggyemu  I had a similar ask

https://docs.microsoft.com/en-us/powershell/module/windowsvirtualdesktop/remove-rdssessionhost

From above powershell doco it states that

When running this command to remove a session host from a persistent host pool, the user assignment is also removed. This is the only way to re-assign a user to a new session host in a persistent host pool.

So the best I was able to achieve was

Remove-RdsSessionHost -TenantName TenantXYZ -HostPoolName PoolABC -Name SessionHostToBeRefreshed

Generate a new token for the session pool via

 New-RdsRegistrationInfo -TenantName TenantXYZ -HostPoolName PoolABC -ExpirationHours 1

 (Export-RdsRegistrationInfo -TenantName TenantXYZ -HostPoolName PoolABC ).Token

Log onto that machine and remove the "Remote Desktop Services Infrastructure Agent" - if there are multiple versions make sure to remove every single one.

The reinstall it (there should be a copy under C:\Program Files\Microsoft RDInfra\Microsoft.RDInfra.RDAgent.Installer-x64.msi)

And when prompted use the token that you generated earlier.

It will take about 5mins for the session host to rejoin.

I would very much prefer a powershell command that can remove assignment rather than uninstalling an agent!