This problem prevents me from connecting to a meeting about 50% of the time.
My router enforces DNSSEC. And half the time zoom.us isn't resolvable. Here's a snippet from my router's logs :
info: resolving zoom.us. DS IN
info: query response was nodata ANSWER
debug: verify: signature mismatch
info: NSEC3s for the referral did not prove no DS.
info: Could not establish a chain of trust to keys for zoom.us. DNSKEY IN
When I reached out to my DNS provider for help they linked me to this DNS security analyzer: