Nobody knows, not even Mendix support. I raised a ticket, but we have not yet solved it.
For two people the workaround in https://forum.mendix.com/link/questions/104218 helped. So try that first, and keep your fingers crossed. Hope it works for you.
https://forum.mendix.com/link/questions/103918
https://forum.mendix.com/link/questions/104218
https://forum.mendix.com/link/questions/103652
https://forum.mendix.com/link/questions/102189
and also https://forum.mendix.com/link/questions/104577