I can't upload worlds to Realms.

I can't upload worlds to Realms. It goes from "Initializing Upload" to "Failed, An error occurred" in varying intervals. This happens no matter the size of the world, how long it's been played on, gamemode, or gamerules. I even tried uploading an old-style world and attempted the transfer on other devices. Nothing works.

Supporting detail: This issue started after Quarantine. Before that, I was able to upload all sizes, played times, gamemodes, and gamerules.