Identitystore ListUsers and ListGroups API results in UnknownOperationException

Hi,

Reproduced in 2 environments:

1. ADConnector->AWS SSO
2. MicrosoftAD->AWS SSO

Provisioning method is ADSync

Tested with latest versions of boto3 and AWS cli both.

When I call ListGroups / ListUsers and other API methods of IdentityStore, I'm facing different errors:

1. When ListUsers / ListGroups without Filters - getting error from the server that I must add filters although this argument was deprecated:

self._client.list_users(IdentityStoreId=self._identity_store_id)

2023-01-29 15:36:20,909 urllib3.connectionpool [DEBUG] Resetting dropped connection: identitystore.us-east-1.amazonaws.com

2023-01-29 15:36:21,351 urllib3.connectionpool [DEBUG] https://identitystore.us-east-1.amazonaws.com:443 "POST / HTTP/1.1" 400 63

*** botocore.errorfactory.ValidationException: An error occurred (ValidationException) when calling the ListUsers operation: Filter is required

You can see in the logs that a request has been made and it's not the SDK that blocks me from listing users without filters.

Second issue is when listing group memberships, getting UnknownOperationException - (the UserId is correct and works with DescribeUser API call). This reproduces both in ListGroupMemberships and ListGroupMembershipsForMember: self._client.list_group_memberships_for_member(IdentityStoreId=self._identity_store_id, MemberId={'UserId': 'REDACTED'})

2023-01-29 15:39:42,371 urllib3.connectionpool [DEBUG] https://identitystore.us-east-1.amazonaws.com:443 "POST / HTTP/1.1" 400 38

*** botocore.exceptions.ClientError: An error occurred (UnknownOperationException) when calling the ListGroupMembershipsForMember operation:

I have only read access to this AWS account. Thanks.