Solarwinds NPM 11 SNMP Trap Error in Logs


I just upgraded to NPM 11.0 and NCM 7.3.1.

I'm trying to get my SNMP trap collection working again. I'm not receiving any traps in the Trap Viewer. When I look at the TrapService logs as soon as the Solarwinds Trap service is started, the very next message is:

ERROR Solarwinds.Orion.Core.Collector.MessageSender.MessageSender'1 - Data send Failed.

System.AggregateException: One or more errors occurred. ---> System.InvalidOperationException: There was an error generating the XML document.

It goes on to say a hex value is an invalid character. Any ideas? Re-run the install, or do I have a setting or service mis-configured somewhere?