Hey guys just to let you know, issue has been resolved. You helped me tremendously. While I was slowly analyzing packets from .pcap file, I have noticed that TCP conversation was always incomplete, and (so stupid of me did not check this before, but I guess you sometimes miss the trees while looking into the woods 🙂 ) did not look at the Layer7 firewall rules on Meraki. It looked like app requested P2P to be allowed, so once I enabled P2P traffic, app started working. Thank you all for joining in this topic and for your help. Best whishes for all of you guys!!!
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