drepouille wrote:Our stake offered to let us use the stake's paid Zoom account...
I run Google Meet from my laptop...
Both are fine programs for 2-way conferencing, meaning the viewers can also be contributors if they're not muted properly. Many hosts resort to manually admitting viewers so they don't get unwanted malicious disruptors. This is great for ward council meetings, bishopric meetings, etc., but (as you discovered) not the best solution for sacrament meetings.
You should seriously consider a 1-way only
webcast solution for sacrament meeting. The advantages far outweigh the slightly more involved setup. The church's Meetinghouse Webcast
(MWC) is a 1-way only program, as are YouTube Live, Facebook Live, and a host of other free and pay live-streaming services. Generally, any number of viewers can join, as they cannot disrupt the video or audio of the webcast, just view and/or listen; however, some apps allow you to restrict webcasts that are not intended for a general audience.
For live-streaming to MWC, you will need someone, such as the stake technology specialist, to setup a webcast for you and give you the RTMP URL, Stream Name (or key), and the Event Code for the event. This is a simple procedure that takes only a few seconds of their time. In fact, they can setup events for future dates, so you could request a month's worth of events at the same time. Each will have their own RTMP URL and Stream Name, so you'll need to keep them safe until it's time to use them. The viewers use the Event Code to watch either live, or delayed up to 24 hours following the event.
The only thing left is to find an app that can accept the RTMP URL and Stream Name to direct its A/V stream to that server. russellhltn suggested the free Larix Broadcaster app, which I've also used and highly recommend.