I have been generating Distribution certificates on Apple developer portal from the last 4 years but this time I am facing an error while uploading .certSigningRequest file.
I have created it like the way I always created i.e. Keychain Access -> Request a certificate from a Certificate authority -> User Email address (Development App ID) -> Save to Disk -> Done
I have also updated my Apple Worldwide Developer Relations Certificate Authority certificate but found no luck.
That would be great if I get any other solution.
Update
I solved it by not leaving Common Name field while creating .certSigningRequest which was not the case before.