Looks like you have *.fabricapp.co configured with a CNAME record, but wildcard domains need to use Vercel nameservers to automatically generate SSL certificates.
Please give that a try and let us know how it goes
Yes this worked. Thank you so much. Just curious if anything changed recently as this was working before. The only change I did was added the ‘*’ record in namecheap domain records that too after I started seeing invalid config error. But before this, the same config was working from a very long time.