I have a fair phone 6 with murena e/OS bought around a month ago. Cannot get wired headphones to work in the phone at all. Either not supported, or the bug still isn’t fixed!
Welcome to the forum 
Could you give some more details?
Are these USB headphones with integrated DAC or are you using a USB or external DAC and in which case which one?
You might be interested in this recommendation and the preceding posts in that topic.
Hello! Thanks for your reply. I’m trying to use Motorola brand USB earphones with integrated DAY
Since you’re running /e/OS you might get better replies on the Murena forum
Can you supply a link to info about the bug that you mentioned?