Hey guys, not sure if anyone has figured out the solution already, but if not I’m happy to say I have figured out the issue… after having the same issues as all of you (headphones working great on Bluetooth, but not wired) I looked into adapters, 3rd party lightning to 35mm cords (both from Amazon and bestbuy) and still nothing worked; I even went to apple for a genius apt and was told it has to be hardware and exchanged them for a new pair. This STILL did not resolve the issue. I decided to try one last thing, and purchased the lightning to 35mm cord from apple. Wouldn’t you know, it worked!!! That’s the solution, you have to buy the $35 apple brand cord.
Now, just to vent and give my opinion and hope that someone from apple reads this… how does a “pro max” branded product, who I’m assuming some professionals use for video and audio editing, not have a 35mm jack port and/or at the very least come this this $35 extra cable. How/why does this not come with the $550 headphones? This has absolutely changed my opinion in the brand/company, like what an absolute scum move to sell headphones at a premium and then if you want to use them wired and/or for travel you have to buy an expensive special cable. C’mon apple, I already gave you the $550 for the headphones, the least you could do is allow them to work however they are needed. And don’t even get me started about the lack of an actual case, that’s an entirely different conversation.