Customer changes an email in Odin Panel> Account> Admins> User XXX > Edit
The following message appears:
Your changes have been saved. Please be aware that your email address is not confirmed. Confirmation email is sent to OLD_USERS EMAIL address. Click the link in the letter to confirm the address.
The confirmation e-mail is actually sent to new address, but message on the screen show old address.
Situation caused by the internal issue PBA-57714, which is fixed in the BA since version 6.0
Consider upgrading OSA to latest version.