I have a few older model access point that fail this test because they can't handle the TLS1.2  only settings on the NPS server.  Here's a note I got from Meraki support on this in 2021.  I think I had some MR16s or 18s that were failing these tests too:   ----- -Informed him that "The TLS version used by MR to test RADIUS is determined by the firmware version. MR 26.x will use TLS 1.0 and MR 27.x will use TLS 1.2. " -----   So if your AP can't handle new firmware, or just hasn't been updated for a while you may get this error after doing the test routine on the RADIUS server. ... View more

I've found depending on how your ports are setup (Trunk / Access) and vlans assigned, you may need to leave the vlan field empty when assigning a static IP.   So, if you Vlan1 is the default and you're on a trunk port - I need to leave the VLAN number off of the WAPs, and leave the field blank actually.    On the Switches I do have the VLAN1 (or whatever is correct) in the IP assignment.   This has frustrated me before, since the error isn't specific to say 'bad VLAN' or something more descriptive...   ... View more