On my Fairphone (Gen 6) I can’t even pair my VMK20 headphones (should support 5.0 APTX HD, SBC und AAC). They show up in “add new device”, I can select them, but after a while it just didn’t pair. This is on /e/OS 3.0.2 official.
I just tested on another FP6 with stock Android → there it pairs. So it’s most likely a software problem.
As there was a brief popup of something aptX related on stock Android, I suspect that it’s some problem with the aptX codec.
Also to debug, I went into developer options and wanted to switch codecs, but the field is greyed out.
This is quite a bummer, because I don’t want to get back to stock android, but also I don’t want to buy new headphones just to be able to hear music on a brand-new phone.
Similar problem here (maybe releated, maybe not): 🎧 AptX unusable on the Fairphone 5