New DC added but only picks up a few devices after rebalancing.

Document ID : KB000115095
Last Modified Date : 14/09/2018
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Issue:
Upgraded CAPM to 3.5, then added a new DC (there was previously just a single DC).
Rebalancing caused only about 35 devices to move to the new DC.
Manual rebalancing has no effect.
Customer firewall team states that there are no FW-related impediments to the rebalancing.
Similarly, customer network team states that the devices currently on the original DC should all respond to the new DC.
Environment:
CAPM 3.x
Resolution:
The new DC is unable to SNMP to any devices, and only could ping 35.
We tried
snmpget -v 2c -c <string> <target ip> 1.3.6.1.2.1.1.2.0
snmpget -v 2c -c <string> <target ip> 1.3.6.1.2.1.1.3.0

Works from old DC to all tested targets
Fails on new DC to all tested targets
Likely acl issue, may be firewall.