Accessing scoped application tables via Table API

[JG6]

Hello Community,

For some reason I've lost the ability to access tables of a scoped application, using the Table API (Yokohama). It used to work, but I probably did something wrong. And I can't find the culprit. I'm always getting a 403 with the response:

{
    "error": {
        "message": "User Not Authorized",
        "detail": "Failed API level ACL Validation"
    },
    "status": "failure"
}

The table is set to be accessible to all application scopes + read & web service access enabled. Logically, this should have been enough. The system log contains an error that is most likely related:

WebServicePolicyValidator: Table access denied by WebService Access Policy. [tableName= x_api_task]: no thrown error

The odd thing is that this seems to be selective. Some tables can be accessed with the Table API and some can't. The only commonality I see is that the barred tables have a reference field to the 'task' table. But then again, table and subtables tables also have reading access via web service. Or it can be something else entirely.

To my knowledge, the barred tables have the default setup. Nothing special that I can see.

I'm most probably overlooking something obvious, but what ? 🙂 

Or is there a way to have Servicenow log something more verbose ?

[KDWeigel]

Did you ever find a solution as i've been experiencing the same thing.