Since my add-in is not yet officially listed in Microsoft AppSource I don't have a link to the add-in in MS AppSource. But as long as my link (currently points to https://store.office.com) does not link to the correct target, the MS test team won't accept my add-in. :(
So, I somehow need to have the chance to look into the future or is there another way? I assume so, otherwise it would be a never-ending story ;)
Reviews are generally generated directly from users, via a link sent by automated email. Users who download an app or add-in from AppSource are sent an email approx. 7 days after download containing a link to review the app/add-in if they wish.
If you wish to add a review link into the app/add-in itself, you will need to wait until the app/add-in has been approved, in order to know the WA ID which is created on publishing and required in order to format your review link.
The link to leave a review should be in the format 'https://store.office.com/writereview.aspx?assetid=WAxxxxxxxx' where WAxxxxxxxx is the WA ID generated once your add-in is approved to AppSource. This WA ID is not available until your add-in is approved. The WA ID is available from the URL of your add-in listing on AppSource