I have two CDN custom domain that has been unable to validate for the past 1-2 weeks. My other custom domains successfully validated within an hour or so, but this one never progresses. I tried deleting the custom domain after a week and re-adding it, but that hasn't helped. I added the cdnverify CNAME records in advance like I did for my other custom domains, and this domain doesn't have email set up on it so there was no validation request. It's not clear to me why the process has stalled. Is there any way to investigate why it's taking so long?