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Turns out the issue was that the CUCM PUB/SUB were setup with IP addresses. I followed the steps to set them up as FQDN: https://www.cisco.com/c/en/us/support/docs/unified-communications/unified-communications-manager-callmanager/211393-Change-CUCM-S...
I also have the same problem with setting this up. I have imported the self signed certificates into my Windows 10 Client in both Enterprise Trust and Trusted Root Certification Authorities. Jabba works with no certificate prompt.
