This usually means your IP address is blacklisted. The connection is immediately blocked. so something triggered their refusal.
Scanning blacklists for your IP address, though, doesn’t raise any flags:
https://mxtoolbox.com/SuperTool.aspx?action=blacklist%3A5.196.200.146&run=toolpage
Your reverse DNS also looks good.
Sorry this isn’t much help. The destination is just blocking you for a reason I can’t figure out.