I resolved it by setting the keys as described here (even though they're not recommended by Microsoft)
https://support.citrix.com/article/CTX267071
Be aware that in my scenario, i had to set the registry keys on fresh profiles. Modifying/adding these registry keys on already existing profiles didn't help, so i ended up resetting profiles before rolling out these keys.
I had to do it this way because i couldn't get the powershell method to work either