Hi, I had a similar issue with DELL Optiplex stations running Windows 10: the DELL station was reusing the same PMKID when roaming from one AP to another AP , or when switching between the 5 GHz and 2.4 GHz spectrums on the same AP. This behavior does not meet the 802.11 standards and was causing client disconnections and reconnections for a few seconds with incident in APs logs Invalid PMKID and the client was disconnected (correct behavior is : AP#1 PMKID #1, AP#2 PMKID#2, if client roams back from AP# 2 to AP# 1 it can reuse the PMK#1,  then from AP#1 to AP#2 it can reuse PMKID#2 ) After upgrading the same station to Windows 11, the issue was resolved. The PMKIDs were different while roaming, as expected. Hope this helps. ... View more