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?
https://oriondemo.solarwinds.com/apps/udt/devices
If so, have you verified that all filters on the left side have been cleared?
Is there any ability to filter? E.G. are there Connected to, vendors, or connection types listed? If so, are there numbers next to each filterable option letting you know how many devices are associated with each 'connected to' node, or vendor or connection type?
Has this page ever worked, or did it stop working after a recent change or upgrade?
According to my knowledge it has never been working