EAP - wifi not connecting / keys exchange failure - local deauth request after exactly 10 seconds

Hello,

Using 19.07.7 on a router newifi3 (newifi D2 - mt76 wifi driver), and EAP-TTLS, I'm facing the following with Windows clients (intel wifi chip with latest intel driver from january 2021)

Sun May  2 11:50:47 2021 daemon.info hostapd: wlan1: STA 34:f3:9a:72:e7:55 IEEE 802.11: authenticated
Sun May  2 11:50:47 2021 daemon.info hostapd: wlan1: STA 34:f3:9a:72:e7:55 IEEE 802.11: associated (aid 1)
Sun May  2 11:50:47 2021 daemon.notice hostapd: wlan1: CTRL-EVENT-EAP-STARTED 34:f3:9a:72:e7:55
Sun May  2 11:50:47 2021 daemon.notice hostapd: wlan1: CTRL-EVENT-EAP-PROPOSED-METHOD vendor=0 method=1
Sun May  2 11:50:47 2021 daemon.notice hostapd: wlan1: STA-OPMODE-SMPS-MODE-CHANGED 34:f3:9a:72:e7:55 off
Sun May  2 11:50:47 2021 daemon.notice hostapd: wlan1: CTRL-EVENT-EAP-STARTED 34:f3:9a:72:e7:55
Sun May  2 11:50:47 2021 daemon.notice hostapd: wlan1: CTRL-EVENT-EAP-PROPOSED-METHOD vendor=0 method=1
Sun May  2 11:50:47 2021 daemon.notice hostapd: wlan1: CTRL-EVENT-EAP-SUCCESS2 34:f3:9a:72:e7:55
Sun May  2 11:50:57 2021 daemon.info hostapd: wlan1: STA 34:f3:9a:72:e7:55 IEEE 802.11: deauthenticated due to local deauth request

The windows 10 client speaks about a failure in dynamic key exchanges
The radius servers correctly sends an Accept:Accept message and MPPE Keys.

Whereas

  • The same windows 10 client connects flawlessly on a second AP (a DD-WRT router serving the same SSID, with the same RADIUS backend and client account).
  • Android 10 client can connect flawlessly
  • raspbian buster client can connect if and only if I use the driver wext (the driver nl80211 cannot connect, it speaks about a failure in dynamic keys exchange too)

Any idea ?

Thank you for reading !

Cheers