#mastoadmins Hey, if your mastodon instance uses letsencrypt, there could be some issues going ahead.
https://letsencrypt.org/2020/11/06/own-two-feet.html
You may very well need to badger the hell out of your certificate provider, masto.host would be the one to do it on if you use their service.
Even if you don't use letsencrypt this could cause issues with federating with other instances. Anyway, good adminining