With iOS 26.0.1 my iPhone 16 pro does not shut off manually

Turn iPhone on or off - Apple Support

Turn off iPhone

• iPhone with Face ID: Simultaneously press and hold the side button and either volume button until the sliders appear, then drag the Power Off slider.
• iPhone with the Home button: Press and hold the side button, then drag the slider.

Try a forced restart to soft reset it

or go to Settings, General , shutdown to see if the button resets.

Or settings, General, Transfer or reset, reset, reset all settings

"With iOS 26.0.1 my iPhone 16 pro does not shut off manually: Pressing button on right side of phone does not turn off phone. This was not a problem with 26.0"

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iPhone Button Not Working After an Update:

A. Go Here: If a Button or Switch isn't Working on your iPhone or iPad – Apple Support

Report this Bug to Apple:

B. Do your Part: These are user-to-user forums. Apple rarely reads these forums on their own time as it is. So, provide Apple with feedback on this.  Apple wont get back to you directly, but the more they hear of this, the more they will know what is going on, and what needs to be fixed. Apple will know nothing if this, if you don't report it to them.

To Provide Feedback:

1. Go Here: Feedback - iPhone - Apple
2. Select: "Bug Report" for the "Feedback Type"
3. Comment: that this all stated after installing an update. Include the URL of this thread.
4. Proceed form there as necessary

It seems like someone is in a third-party and I never gave permission for no third parties. I think my phone was crossed device.