Avoiding eye contact is typically associated with autism, but there is a lot of overlap between autism and ADHD. See also AuDHD
I often get overwhelmed with too much information when making eye contact, and I'm rarely able to listen/understand while making eye contact. The easiest way for me to listen is to be looking anywhere else. This does not always go well in a corporate environment, and did not go well when my parents were trying to reprimand me.
Phone calls or online meetings instead of face-to-face meetings can help (if you can cope with that). Otherwise, learning when eye contact is socially necessary and when you can relax a little can go a long way (or so I've heard, I still haven't mastered this one).