I am using SG230 all network traffic is normal but only have problem with zoom. I disabled all functions (qos, web filter, application control...) but no luck. Other video conference program is ok. Only Zoom has problem.
look in IPS / UDP flood - usually you will find lots of Zoom packets blocked there. UDP 3478, 3479, 8801 - 8810
Make exception for the ports.
And maybe tell us about your setup. Are you using proxy? Standard and/or transparent mode? And are you using the zoom Windows application?
no proxy. Standard mode. Yes, using zoom windows application