cisco – Webex not using DNSSEC

our government issued a statement that all video/voice online enabling software needs to use DNSSEC for all address translations and all used DNS servers need to support DNSSEC.

I tried few DNSSEC checkers and analyzers (https://dnssec-analyzer.verisignlabs.com/www.webex.com) for “my_organization.webex.com” or even “webex.com” and to me it seems like this domain doesn’t use/support DNSSEC.

I can’t find any relevant information on Cisco/Webex website.

I for one can’t believe Cisco Webex wouldn’t use DNSSEC so my question is: Am I missing something? Or is there a reason to not use it?

Thank you