Run this to reset its configuration. turn off and on bluetooth and connect bluetooth headphone again. i had same issue on ubuntu 16.10 and it solve it! in this case you don't need blueman. run this and in Sound setting select your headphone
On this page of the site you can watch the video online Blueman connection error (bluetooth issue)Linux. with a duration of hours minute second in good quality, which was uploaded by the user CyberFizz 10 July 2021, share the link with friends and acquaintances, this video has already been watched 1,534 times on youtube and it was liked by 15 viewers. Enjoy your viewing!