Do you still see this issue ?
Let me know and I can send an invite to troubleshoot.
I'm having the same issue. Installed CUPM 9.0. Everything worked as far as syncing devices went. Then upgrade to 9.5 and now my CUCM device won't sync. Infrastructure sync just hangs at 1%.
Did you get this resolved? If so can you share your answers?
I am having this problem, too. Did you find a resolution? I actually have an upgraded 10.5 system, but the symptoms are suspiciously similar.