auto lock greyed out
Device is not on low power mode, but the auto lock is greyed out.
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Do you have a MDM profile?
See this Apple article: Checklist: If you want to see if anyone else has access to your device or accounts
Checklist: If you want to see if anyone else has access to your device or accounts - Apple Support
See point 5.
Some company have policies that you can't change it due to security reasons.
So contact your company.