HI @Arto Kangas
Welcome to the community!
As per the snapshot you attached...
1. Is the "Users" group that has been mapped with the "Users" role in user and roles in that project?
2. Check whether that user has the Schedule issue permission for that board-specific filter in which this sprint is created and user is trying to move the issue into it?
2. Attached Schedule issues.PNG is screenshot from board-specific permission Scheme so that should be OK also.
Let say ...your board is using a filter like ..project in (X,Y ,Z) and status = In Progress then the user should have the schedule issue permission for all the projects that are involved in the filter.
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