Ok so my domain is bobbyindex.com and my sub domain is searchbooks.bobbyindex.com
I want searchbooks.bobbyindex.com to point to my website which is hosted on Firebase and the link is visual-search-231414.firebaseapp.com
I bought the domain from TSOHOST and have setup up custom DNS records for my sub domain to point to my Firebaseapp.
Now after switching to Cloudflare, my domain seems to work fine but had issues running my sub domain, so I added CNAME records on my domain to enable my subdomain.
After adding CNAME record my sub domain is working but not displaying my actual firebase hosted web app.
I am new to all this. I even asked TSOHOST but they asked me to contact cloudflare.