Screen shot is not working via buttons OR accessibility as welll on iOS 15.1 and iPhone xs max
How do I fix the screen shot not working on iPhone XS Max on ios 15.1?
iPhone XS Max, iOS 15
See this for how to take a screenshot with the iPhone. Take a screenshot on your iPhone - Apple Support If this is not working, then you can use the Get Support link at the top of the page here to contact Apple Support for assistance.