Don't want to hide my email, and I don't want to send them from an old address!

Hey there. Just updated to Ventura and now Mail isn't letting me send emails from my iCloud.com account. I can do it in Safari, but Mail gives me just two options: an old email I'm keeping open for security reasons and "Hide My Email." I went to settings and then composing and then "Send new messages from" and lo and behold, there is no option there for selecting my iCloud address. What to do?