Dear fpefpe,
Thank you so much for your reply!
Please try uninstalling the Quick Assist app. Create a new user profile as an administrator, ensuring you install the Quick Assist app from the new user profile. Run the app from there and check if you are able to use Quick Assist on the new user profile.
Create a local user or administrator account in Windows:
https://support.microsoft.com/en-gb/windows/cre...
For additional information, please visit the article link below, which may be helpful for you:
https://www.thewindowsclub.com/quick-assist-not...
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
Warm Regards,
Arif