Get-MgIdentityGovernanceAccessReviewDefinitionInstance returns 500 error

Describe the bug

When running this cmdlet

Get-MgIdentityGovernanceAccessReviewDefinitionInstance `
-AccessReviewScheduleDefinitionId $schedule.Id -Filter "Status eq 'InProgress'"

I get a 500 internal server error. When I switched to the Beta module to test, I also got a 500 error, but the error said that this call was deprecated. I switched my script to use the Invoke-MgFilterIdentityGovernanceAccessReviewDefinitionInstanceByCurrentUser cmdlet (as suggested by the API doco) everything started working again.

Should this cmdlet be working or not?

Expected behavior

command executes without error and returns a list of instances

How to reproduce

1. Execute Get-MgIdentityGovernanceAccessReviewDefinitionInstance -AccessReviewScheduleDefinitionId $schedule.Id -Filter "Status eq 'InProgress'"
2. See error

Get-MgIdentityGovernanceAccessReviewDefinitionInstance_List: An error has occurred.

Status: 500 (InternalServerError)
ErrorCode:
Date: 2026-02-23T23:56:26

Headers:
Vary                          : Accept-Encoding
Strict-Transport-Security     : max-age=31536000
request-id                    : abcb8795-48c2-4233-8b1e-61685e0a3148
client-request-id             : d1b37d8c-bfdf-4de2-b043-4114373bbe33
x-ms-ags-diagnostic           : {"ServerInfo":{"DataCenter":"Australia East","Slice":"E","Ring":"5","ScaleUnit":"002","RoleInstance":"SY2PEPF0000208C"}}
Date                          : Mon, 23 Feb 2026 23:56:25 GMT


  Recommendation: See service error codes: https://learn.microsoft.com/graph/errors

SDK Version

2.35.1

Latest version known to work for scenario above?

No response

Known Workarounds

No response

Debug output

</details>


### Configuration

Name                           Value
----                           -----
PSVersion                      7.5.4
PSEdition                      Core
GitCommitId                    7.5.4
OS                             Microsoft Windows 10.0.20348
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

### Other information

_No response_

Start by reproducing the Get-MgIdentityGovernanceAccessReviewDefinitionInstance command from the issue with SDK version 2.35.1, then compare its response with the beta module and the Invoke-MgFilterIdentityGovernanceAccessReviewDefinitionInstanceByCurrentUser workaround. Check whether the failure is in the cmdlet request or the service response; done means the supported behavior is confirmed and the issue has a fix or documented resolution.