API GET fails when querying top level categories

We’re trying to develop an integration, and we just noticed a problem when using GET for top level categories like:

For those we’re getting:

    "error": "authentication failed: not authorized",
    "code": 16,
    "message": "authentication failed: not authorized",
    "details": []

But the same token works for other POST actions.

Checking the application server logs we see:
time="2022-02-17T14:57:06.400052461Z" level=info msg="finished unary call with code Unauthenticated" ctx_id=8fda7bff-65d7-4813-882d-8c60324d5b76 error="rpc error: code = Unauthenticated desc = authentication failed: not authorized" grpc.code=Unauthenticated grpc.method=List grpc.service=api.ApplicationService grpc.start_time="2022-02-17T14:57:06Z" grpc.time_ms=3.279 peer.address="" span.kind=server system=grpc

Any hints will be appreciated.

For some API actions you might need to specify for example the organization ID as a filter.