UR22 mkII - low headphone signal

Greetings. I’m sort of interested in bying this piece of gear, but this ‘headphones signal issue’ you talk about seems to be a concern. Is the information on this other Steinberg thread “ur22 Very low audio output through headphones” (topic ID 57354) valid / useful ? Or the MIX (INPUT/DAW) knob level has nothing to do with the issue ? Can anyone check and reply ? Thanks in advance and regards.