When editing the expiration date for a user in Admin by completely removing the expiration date set to null and clicking save. The change is not saved, and the expiration date remain.
Expired Date for user Expiration Date Changing the expire date to never in Admin
There are two options:
1. Change the expiration date to a date in the future. 2. Delete the user in Admin and recreate the user again and set the expiration to never. *Please note that if option 2 is selected, the history of the user is will be lost and this cannot be retrieved.
This is a design limitation as it is expected for the user with an expiration date to be deleted from the Marketo Instance after the expiration date has been reached.