Airpods pro max stopped working after one year

Hi _pb__

welcome to the Apple (user-to-user) Community!

Re: Airpods pro max stopped working after one year

Apple support's online article: Connect and use your AirPods Max - Apple Support

says:

"make sure that the device that you want to pair is up to date."

Eg: iPhone: About iOS 17 Updates - Apple Support says iOS 17.3.1 is the latest version.

NB: If your device has the newest update installed, the AirPods firmware can automatically update.

More info: About firmware updates for AirPods - Apple Support

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The factory reset was a good thing to try. Since it hasn't solved the issue: wondering if this is the method you used to reset your AirPods Max: How to reset your AirPods Max - Apple Support

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You may want to make sure nothing (a speck of dirt or wax) is blocking any openings:

Cleaning AirPods, AirPods Pro, AirPods Max, and EarPods - Apple Support

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Could the volume be set so low it appears the AirPods Max are not working ?

Eg: Scroll to "Listen and control audio with your AirPods Max" in the article (link below)

Connect and use your AirPods Max - Apple Support

and

Customize headphone audio levels on your iPhone or iPad - Apple Support

or

Could it be the audio settings on iPhone / iPad / Mac / PC / Android device need adjusting

Eg: Adjust the mono audio, balance, and phone noise cancellation settings on iPhone

Adjust audio settings on iPhone - Apple Support

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If you wish: You can Find the serial number of your AirPods - Apple Support

and

Enter serial number online to Check Your Service and Support Coverage - Apple Support

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If more support is needed:

AirPods Service and Repair website:

AirPods Repair & Service - Apple Support

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AirPods Support Website:

Find all the topics, resources, and contact options you need for your AirPods....

AirPods Support - Official Apple Support

All the best :-)