SharePoint API issue

[DanielMonger]

I have a fairly straight forward app built that connects to a SharePoint online list, has the ability to enter a new record/edit records. Some users are having an issue where no data is being presented and their licensing/access is identical with other users. I have run a monitoring session and 1 issue I have found that I cannot find an answer to is why the users having the error appear to be using this to query the list; (bold items are the difference)

Request:

"url":"https://australia-001.azure-apim.net/apim/office365/ ".......................(entity and table details I have deleted) 

"method": "GET",
"headers": {
"x-ms-pa-client-telemetry-options": "paclient-telemetry {\"operationName\":\"/providers/microsoft.powerapps/apis/shared_sharepointonline.LookupFn_RequestStatus\"}",
"x-ms-protocol-semantics": "cdp"
},
"body": ""
}

Response:
{
"duration": 0,
"size": 0,
"status": 404,
"headers": {
"Content-Length": 54,
"Content-Type": "application/json",
"x-ms-client-request-id": "7f62a4d7-f92d-4d51-a223-a6548dc22898"
},
"body": {
"statusCode": 404,
"message": "Resource not found"
}
}

Users that have no issues are using the URL "https://australia-001.azure-apim.net/apim/sharepointonline" .......................(entity and table details I have deleted). All the rest is the same (obviously with a success response) 

Has anyone come across this issue and solved it?