Simultaneous Authentication of Equals (SAE) with SAE Hash-to-Element (H2E), which are mandatory for Wi-Fi 6E, are not working in Network Manager
Wi-Fi WPA3 (and Wi-Fi 6E which requires WPA3) use a new authentication and key management mechanism called Simultaneous Authentication of Equals (SAE). This mechanism is further enhanced through the use of SAE Hash-to-Element (H2E)
SAE with H2E is mandatory for WPA3 and Wi-Fi 6E.
SAE H2E is apparently not functioning in the versions of Network Manager (1.30.0), or WPA_Supplicant (2.9) provided with Ubuntu 21.04.
As far as I know, the only way Ubuntu can currently support WPA3 and Wi-Fi 6E is by building WPA_Supplicant from the developer's source, disabling Network Manager, and manually setting the network configuration in a wpa_supplicant.conf file.
Further details are available in earlier (unanswered) AskUbuntu posts here and here.