Problem
You click Change in the mass change dialog but receive an error message instead of a confirmation.
Possible cause
Common causes include: the selected type is no longer active, the valid-from date is in the past (it must be at least tomorrow), or a network issue interrupted the request.
Solution
Read the error message carefully — it usually explains what went wrong.
Check that the valid-from date is at least tomorrow.
Make sure the selected type is active and available.
Try changing fewer memberships at a time to isolate the problem.
Check your internet connection and try again.
If the problem persists, contact support and include details about:
The error message shown.
Which type and start date you selected.
When the issue occurred.