Windows 7 Desktops unable to connect

Is anyone having success with Windows 7 pools?

I am trying to provision a Windows 7 pool and am unable to get it working with my custom image or the windows 7 image from the gallery.

I get "An error occurred while Remote Desktop Connection was accessing this resource. Retry the connection or contact your system administrator."

I have confirmed the session host appears to be ready:

SessionHostName : WVD-W7-ENT-1
TenantGroupName : Default Tenant Group
HostPoolName : W7ent-P1
AllowNewSession : True
Sessions : 0
LastHeartBeat : 11/14/2019 18:41:58
AgentVersion : 1.0.1486.900
AssignedUser :
OsVersion : 6.1.7601
SxSStackVersion : rdp-sxs190905003
Status : Available
UpdateState : Succeeded
LastUpdateTime : 11/14/2019 17:53:18
UpdateErrorMessage :

Connection error is:

ErrorSource : RDAgent
ErrorOperation : OrchestrateSessionHost
ErrorCode : -2147024809
ErrorCodeSymbolic : ConnectionFailedOrchestrationFailureUnexpectedError
ErrorMessage : O_ORCH_FAIL
ErrorInternal : True
ReportedBy : RDGateway
Time : 11/14/2019 14:46:05

ErrorSource : RDAgent
ErrorOperation : OrchestrateSessionHost
ErrorCode : -2147024809
ErrorCodeSymbolic : ConnectionFailedOrchestrationFailureUnexpectedError
ErrorMessage : O_ORCH_FAIL
ErrorInternal : True
ReportedBy : RDGateway
Time : 11/14/2019 14:39:49