One thing to be verified here is that Activity Source should be App or Web while making the API call.
Mon, 25 Jan, 2021 at 1:58 PM
In the API call for APN, the API key used should be of the Admin only. This needs to be verified on getting this response.
Mon, 25 Jan, 2021 at 2:00 PM
Offline activity API call file size limit is 5MB
Thu, 28 Jan, 2021 at 8:12 PM