I've setup a payload under passcode, given maximum auto-lock time is 15 minutes.
However, on my iPad it's still locked in 2 minutes(by default) and the iPad allows user to modify the time as they like.
Is there any way to disable the setting to prevent users in changing the time, and iPad will lock at 15 minutes according to the payload?
I couldn't find much information of this issue.
I think you have the answer in your post.
When you set the MAXIMUM auto-lock time to 15 min, you allow users to set auto-lock time to 15mn MAXIMUM.
You do not set the time but the maximum time.
Casper allows 4, 3 or 1 min, but iPad not, so you will see 2min for values under 5min.