Can't reconnect to mastodon.social?

Awhile back I disabled crossposting to mastodon.social, but when I went to re-enable it, I get this error:

“There was an error while getting the Mastodon server hostname. Try to authorize your Mastodon account again.”

I can access mastodon.social fine, am logged in, etc. Not really sure what else to try but it looks like resetting something has worked for other users?