Problem
The form shows the message "Please select at least one centre".
Possible cause
You must select at least one centre in the Centre availability field before you can save the discount code. If no centres appear in the list, there may not be any centres set up on your account yet.
Solution
Click the Centre availability field and select at least one centre from the list.
If the list is empty, contact your administrator to have a centre created first.
If the problem persists, contact support and include details about:
Whether any centres have been created on your account.
When the issue occurred.