Work permit Document Supplement

My company has applied for a work permit and I’m monitoring the progress online. It has shown “under review for more than a week… finally, the status changed to “ Document Supplement”. We don’t know what document supplement they needed and tried to call before the office closes but to no avail.

By updating status, if a document supplement is needed I think it should require the office to call the applicant and specify what documents are needed because such details are not put online.

Anyone here experienced something like this?

Did you figure out what else they needed?