I also use Jerboa and can confirm this: the app crashes shortly after trying to connect to discuss.online.
I tried to add discuss to the Liftoff app, but it says that the instance cannot be found.
I tried that on Connect, and I'm unable to sign back in. I've unable to use any apps with this instance for at least 2 days. The website seems to work ok weirdly but that's not ideal for me for accessibility reasons.