I used to interview candidates via Zoom. There were quite a few who couldn't figure it out. I gave 2nd chances interviews, mostly for optics for upper management. (And because sometimes hardware breaks at the last minute.) The candidates always failed the retry interview.

At least for software development, troubleshooting a camera and mic is a pretty similar skill to what our job is on a day-to-day basis. It's also very disrespectful to make someone wait at the beginning of a meeting while you troubleshoot, especially when I'm waving my phone and sending IMs that ask the candidate to just use their phone.

But, if a candidate fell back to their phone, I appreciated that they respected my time.