[[VIVEPORT] UserStats.DownloadStats fails error 50001]

I was on a beta testers account, logged in with the account that had made the listing and can confirm that this fixes the error !

[[VIVEPORT] UserStats.DownloadStats fails error 50001]

Hi,

I'm trying to implement viveport stats and achievements, but the callback from UserStats.DownloadStats keeps returning error 50001.

The documentation says:
50001 HTTP    Invalid account ID/VIVEPORT ID/VIVEPORT Key

I've already confirmed that the Viveport ID is correct and its the only thing needed for the initialization of the achievement api (according to the documentation).
I do get a valid account data back from User.GetUserId() and User.GetUserName().

Any help on this ?
I've found some other people with the same problem but all treads seem to be dead/abandoned without a solution. @Corvus

https://answers.unity.com/questions/1536117/anyone-know-how-to-solve-the-50001-error-with-vive.html