DNS Proxy Issue

Hey Community, One of the CNAME is not getting Verified at my Substack Account. CNAME = newsletter, Targetted to target<dot>substack-custom-domains<dot>com. As per Substack DNS proxy hasn't been Switched Off but i see its Off at my end. As a result of this my url newsletter<dot>consultantmanpreet<dot>com is showing 403 Forbidden Error. What could be wrong! Thanks in Advance! I tried deleting the CNAME and adding it again and made sure DNS proxy was Off but my CNAME newsletter.consultantmanpreet<dot>com shows 403 Forbidden Error. As per Substack Team its due to DNS proxy not being properly Shut off.