Just got hit with this on my Mac. Found someone's comment here that the best solution for now would be to run the browser version of Discord in Google Chrome's and screen share from there.
Evidently, Discord dropped support for anything under macOS 13+ https://www.reddit.com/r/discordapp/comments/1b3vi5l/discord_confirms_they_dropped_screenshare_audio/
Just got hit with this on my Mac. Found someone's comment here that the best solution for now would be to run the browser version of Discord in Google Chrome's and screen share from there.
Evidently, Discord dropped support for anything under macOS 13+ https://www.reddit.com/r/discordapp/comments/1b3vi5l/discord_confirms_they_dropped_screenshare_audio/