Grant new app token failure

Product: PowerShell Universal
Version: 3.9.15

Trying to dynamically create app tokens for access to authenticated api endpoints and I keep getting the following error when attempting to use “Grant-PSUAppToken”

[error] Status(StatusCode="Unknown", Detail="Exception was thrown by handler.", DebugException="Grpc.Core.Internal.CoreErrorDetailException: {"created":"@1691095900.321000000","description":"Error received from peer ipv6:[::1]:59044","file":"..\..\..\src\core\lib\surface\call.cc","file_line":953,"grpc_message":"Exception was thrown by handler.","grpc_status":2}") 

Here is how I am attempting to create the app token

$date = $($(get-date).AddHours(24))

Grant-PSUAppToken -IdentityName "Test" -Role "Operator" -Expiry $date -Integrated -Verbose

The Test identity is already created