I did a vanilla installation of jitsi-meet on a new server with Debian Stretch. It worked!
However, I do need some authentication so I followed the simple instructions here:
2020-03-18T22:33:13.126Z [connection.js] <c.l>: CONNECTION FAILED: connection.otherError o @ Logger.js:154 Logger.js:154 2020-03-18T22:33:13.136Z [features/overlay] <Object.componentDidMount>: The conference will be reloaded after 17 seconds. Logger.js:154 2020-03-18T22:33:13.141Z [features/base/connection] connection.otherError o @ Logger.js:154 Logger.js:154 2020-03-18T22:33:13.237Z [modules/RTC/RTCUtils.js] onUserMediaSuccess Logger.js:154 2020-03-18T22:33:14.097Z [modules/UI/videolayout/SmallVideo.js] <g.w.updateView>: Unable to init avatar - no id g o @ Logger.js:154 DevTools failed to parse SourceMap: chrome-extension://hdokiejnpimakedhajhdlcegeplioahd/sourcemaps/onloadwff.js.map DevTools failed to parse SourceMap: chrome-extension://gighmmpiobklfepjocnamgkkbiglidom/include.preload.js.map Logger.js:154 2020-03-18T22:33:14.500Z [features/base/storage] <Object.persistState>: redux state persisted. 53bb95da47d716d3070f4e34bed63f9c -> 17fa5f248b9888d94dfd6f836e12b75a DevTools failed to parse SourceMap: chrome-extension://gighmmpiobklfepjocnamgkkbiglidom/include.postload.js.map
I confess that most of that console info doesn’t mean much to me, but I’d be very grateful for any pointers you might be able to offer (and I appreciate that you must be rushed off your feet just now, with the entire world suddenly wanting videoconferencing – thank you for your time!)