Building WP plugin on top of "All in one video pack", bulk upload problem

I’m working on wordpress plugin, that is working on top of the “All in one video pack” plugin. Both plugins configured to connect to my self-hosted Kaltura CE.
The problem is I’m getting “The access to service [bulkUpload->list] is forbidden” error, while trying to get status of the created bulk upload (bulk upload created and processed without any errors). For any API requests I’m using user, that was registered during installation of the “All in one video pack” plugin (user with “Publisher administrator” role). Any advise will be greatly appreciated!