Hello, I have the same issue, the one that chadblumenthal mentioned. I use Google Domains and tried lots of stuff mentioned here in forums but cannot setup my domain, it even appears an error now when I try to enter: crefacil.mx
I send screenshots:
for what i can see your adalo app domain is app.crefacil.mx and not www.crefacil.mx
go to your app on adalo → settings → domains
and click the “reload” botton that will reset your SSL.
And wait 30 M
Hope it helps.
Thank you Alfonso! The thing is, my original domain is crefacil.mx, I typed app before the domain because I saw it in the comments, but I would like to use the original domain. When I try to follow Adalo´s instructions, this happens (it says I cannot add a register to the root domain):
ok, i also never been able to register a root domain, so i also use the app.xxx.com
Hope some one knows how to do it.
Let´s hope some good samaritan answers 
Have you tried using www as your NAME field?
NAME: www
Type: CNAME
Points to: hosting.adalo.com
That should do the trick.
Thank you charleshope, but since I made changes all that happes is this: DNS_PROBE_FINISHED_NXDOMAIN
Now I cannot even see the webpage 
