This is for a new change in the IOS 15.2 and above. Any time you delete a user from the config you will now be prompted to ensure you want to delete the user. Example:
This operation will remove all username related configurations with same name.Do you want to continue? [confirm]
This requires a change to the adapter to loop through any number of these prompts to delete all users indicated.
Please see attached Modified 8.6 adapter for the changes proposed.