High Sierra 10.13.06 OS Can't access meetings that I am invited to

I am on an old MacBook Air with OS High Sierra 10.13. A couple of weeks ago I started having problems joining meetings. I can host with no issues but I can't access invites sent to me. The only way it works is if I log on using a newer device then switch to the old MacBook on the App. Any insights, suggestions would be welcome. Thanks