If the Auto Lock setting on iPhone is stuck or greyed out, you won’t be able to disable Auto-lock or change Auto Lock duration. You can find below the steps to fix the problem of Auto Lock Greyed Out on iPhone.
Auto-Lock Setting Not Working on iPhone
The most common reason for Auto-Lock option being locked on iPhone is due to Low Power Mode being enabled on your device.
When Low Power Mode is enabled on iPhone, the original Auto-Lock settings get over ruled and your device is set to the lowest possible Auto-Lock period (30 seconds). This happens, even if your device is set to ‘Never Auto Lock’.
Unfortunately, there is no option on iPhone to both enable ‘Low Power Mode and also prevent your device for changing its original Auto-Lock period.
Hence, the only way to fix the problem of Auto-Lock option being grayed out on iPhone is to manually disable Low Power Mode on your device.
Fix Auto-Lock Greyed Out on iPhone
Follow the steps below to fix the problem of Auto-Lock option being greyed out on iPhone.
1. Open Settings on your iPhone, scroll down and tap on Battery. On the next screen, move the toggle next to Low Power Mode to OFF position.
2. After this, go back to Settings screen and tap on Display & Brightness.
3. On the next screen, scroll down and tap on Auto Lock.
4. On Auto Lock screen, select a longer Auto Lock duration (1 to 5 minutes) or select the Never option.
Hopefully, the above steps should fix the Auto-Lock problem on your device.