@Mark Klaver
Hi,
According to your description, it is difficult to reproduce your situation.
I suggest you try the following methods to see if the problem can be solved:
https://www.surfacetablethelp.com/2017/04/quick-assist-app-fails-not-working-in-windows-10-creators-update.html
Please note: Information posted in the given link is hosted by a third party. Microsoft does not guarantee the accuracy and effectiveness of information.
Hope above information can help you.
============================================
If the Answer is helpful, please click "Accept Answer" and upvote it.
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.