Hello @Sjors Miltenburg ,
Welcome to Microsoft Q&A!
There is currently no API to find user unsubscribed information in UWP.
I'd suggest you submit a feature request about this feature in the Feedback Hub.
You could find the Feedback Hub in the Start Menu.
Please select Developer Platform->API Feedback as the category when you submit your request.
The related team will check the request.
Thank you.
Junjie
If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.