Here's what I wrote about Pitfall #1 in Effective Virtual Conversations:
"Pitfall #1 – Technology Doesn't Work
Knowing your platforms is critical. Through practice and experience you will be able to figure out some of the immediate steps when technology doesn't work.
Solution: When breakouts don't happen as planned, you might need to adjust on the fly and change the activity into a chat, voice or whiteboard activity.
Having a back-up is key, and allowing yourself enough time at the start of the virtual event to know that things are working okay is also another way to mitigate against this common pitfall. Just as you want to show up in the room a few minutes in advance of an in-person event, build yourself a buffer so you arrive in the meeting space well in advance of your participants." (Excerpt from Effective Virtual Conversations page 277 and 278, Copyright 2017 Jennifer Britton)
Tech often doesn't work as planned, and working from a mindset of "it probably won't work as planned, helps us plan for different eventualities.
What are the tech issues you are concerned with?
Make a list of the different things that you could do to course correct if it does happen.
With whatever platform you are using, review the different tutorials and/or supports they have available.
With best wishes,