Hi Tom,
I suggest you delete and re-add the domain.
You can refer to this link: onlinehelp.microsoft.com/.../jj655392.aspx
Note: After your domain is verified, click Cancel in the Add a domain wizard.
Don’t continue to the page where you update your name server records to point to Office 365 name servers. Instead, configure the DNS records at your DNS hosting provider.
@Adsdf thanks for your useful information.
Thanks,
Jerry Cen