Hi, I have been using Apple ear phone with Apple 13pro Max a while, today while then I got suddenly noticed accessory not supported any suggestions for remedy this please, while using charger it’s working fine

Hey there nithi1314,

We'd like to help, so let's start by confirming more details to better understand what's happening, along with ruling out some possible causes:

1. When did this first start?
2. If these are a pair of Apple-branded headphones, which model are you using?
3. Does this same message show when testing another pair of headphones with your iPhone?
4. Sometimes unexpected behavior can be resolved with a restart: Restart your iPhone
5. We see you have iOS 16 installed on your iPhone, but the latest version is iOS 16.3. You can verify this within Settings > General > About. In case you needed it, this link shows how to first back up, then Update your iPhone or iPad.

Cheers!