I seem to be having this exact same issue. I have 2x 3850 switches and a 5760 wireless controller. The switches are on 3.2.3 and the controller I've tried on both 3.3.0 and 3.3.1 with the same results. The devices will show up in Prime but with no data and the inventory collection fails with the above stated failure. The 3 devices also do not show up on the controllers or switches tab in Prime. I have tried altering my snmp configuration but nothing seems to work. I am able to perform an snmp walk from the prime console to the three devices but nothing seems to show up as incorrect here.
There are few interoperability issues between 2960x and other vendors.
In this article we will go over the steps on how to debug these issues.
Check the phy id from “show controllers ethernet-controller phy” output.
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