I just solved the Jabra 410 problem on mine last night, and it’s easier than the last version!
Using a fresh raspbian_Picroft_2018-03-14.img I find the microphone works by default. as shown by the microphone level indicator on the pretty text screen that launches by default when you log in. This did not work under picroft-wip-20180119.img that was the first one I tried some time ago.
To get the sound output working, change the following lines in /etc/mycroft/mycroft.conf. I spent a lot of time editing /home/pi/.mycroft.conf and /home/mycroft/.mycroft.conf as per some of the documentation floating around, and debuging as a user, but this doesn’t work. I think the audio daemon runs as a different user or root, thats why you must edit the copy in /etc/.
"play_wav_cmdline": "aplay -Dplughw:1,0 %1",
"play_mp3_cmdline": "mpg123 -a plughw:1,0 %1",
This assumes you have the Jabra plugged in on boot, and it gets the same ID numbers as mine 
but that should be seen from “pacmd list sinks”
Don’t forget to reboot after the changes.