We have some users experiencing this as well. What we have identified is users who are on Mojave OS and 3.0 are unable to find devices. Further testing is to be completed, but this is what we have found so far.
Are you running Mac or Windows? What OS?
Mac OS 10.14.1, Proximity version -
After updating to version 3.0 I am unable to connect to TP in any conference room.
I am having this issue as well with version 3.0.0 and Windows 10. I am attempting to connect to a MX800 running version:
ce 8.3.6 Final 5045787 2018-08-09
This issue seems to be specific to Lenovo X1 Carbons. There is a workaround listed here: https://community.cisco.com/t5/cisco-proximity/proximity-not-working-for-lenovo-x1-carbon-from-last-1-week-or/m-p/3736186
The workaround details unchecking Enable audio enhancements
There is no issue with v 3.0.0 running on macOS 10.13.6 (High Sierra).
This issue is happening on all of our HP laptops that are running the 3.0 version. installing the old version 2.0.8 works but then proximity auto updates to 3.0 after awhile. Is there a way to stop Proximity from updating to 3.0? I will also try looking a unchecking enhancement.