Win10 cloud-only Intune managed, 1909 and 2004 devices. I get:
"Firewall Error -2016345612"
ERROR CODE
0x87d101f4
ERROR DETAILS
Syncml(500): The recipient encountered an unexpected condition which prevented it from fulfilling the request
I noticed that first when I create the compliance policy, it is green but after some usage, it turns to error. Seems like a bug. I use only Win10 protection, no 3rd party and Firewall is own and Security Center is green in Win10.
