Cloudflare Site Eating CNAME `name` field.

I'm trying to get the SendGrid API working via my Cloudflare DNS records however when I put in the required
name
into the name field, it eats a portion of it.

For instance, I am attempting to put in url163.mysite.app it truncates it to url163 then on SendGrid site it says...
Expected CNAME record for "url163.mysite.app" to match "sendgrid.net", but got "".

Is this a DNS issue, or a me issue?
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