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We use Skype for Business, and it's a common cause of issues. We have constant issues with different individuals not being able to join meeting invites (although the dial in always works, the app doesn't), people being able to join but video/screenshare or audio not working, it refusing to acknowledge the leader so it doesn't start, etc. Our IT team has sent out a bunch of surveys trying to triage the cause of the in…
We used Skype for Business until a few months ago and had a fair amount of issues. We switched our Office 365 accounts all over to Teams and everything has been working a lot better since.
Switching to Teams has made life a whole lot better.