Under user device tracker inventory no devices are shown wonder if anyone has experienced this issue, What could be the cause of this issue?
Can I assume you are referring to the following page?
If so, have you verified that all filters on the left side have been cleared?
Can you verify that you are monitoring ports in UDT? For example, you should be able to verify this by looking at the Device Tracker Summary page in the All UDT Nodes resource as pictured below.
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