my https://www.mail-tester.com/ results are saying
DomainKeys Identified Mail (DKIM) is a method for associating a domain name to an email message, thereby allowing a person, role, or organization to claim some responsibility for the message.
i have already cross checked my dns record and already tried existing solution like removing double quite from domain key txt record .
Also remove the whitespace in the public key tag as the characters should be a continous string. Leaving the value empty or havng whitespaces deems it invalid.