Prime 3 not able to add ISE 2.1

[tisnow]

Do we have a list of known reasons why one would not be able to add ISE services to Prime.

Routing Issue

Time Sync

Self-Signed Cert on ISE

Incorrect username/password

Version incompatibility

Bug

[hslai]

PI 3.0 is not compatible with ISE 2.0+. Please use PI 3.1 instead. See also Cisco Prime Infrastructure Compatibility Matrix