New version v12.0 on AppStore, hostname error (fixed, update in review)

Just downloaded / updated to v12,0 from the AppStore, continually get this:

I tried on Wifi and mobile data and with a VPN, all was the same.
Any ideas? I normally use Reeder but was keen to check out the new version

Just noticed this too. Oh man, what a mess. I submitted the fix but it’s going to be 24 hours before it goes through.

I requested an expedited review, so it should be fixed momentarily!

Setting the custom domain to in the preferences got it working for me.

New version is out and should fix the glitch. Thanks for your patience!