Hi, @martinzen, there are two steps to getting this working.
One is adding the custom domain here:
I don’t see dev.groovly.fm
added there yet. The other is to have DNS record in place and I don’t see that when I test:
$ dig dev.groovly.fm CNAME +noall +answer
; <<>> DiG 9.10.6 <<>> dev.groovly.fm CNAME +noall +answer
;; global options: +cmd
Did you remove those now? If you want add those and troubleshoot this further, please let us know.