my Microsoft Surface3 no longer “wifi-connects” to my router – problems with “WPA3 transition mode” (WPA2 + WPA3)

My Microsoft Surface3 runs Windows 10.

It sees all my wi-fi networks. But still:

unable to connect to this network

I had to disable the “WPA3 transition mode (WPA2 + WPA3)” and fall back to “WPA2 (CCMP)“.

• https://en.avm.de/service/fritzbox/fritzbox-7590/knowledge-base/publication/show/509_Wireless-device-cannot-establish-a-connection-to-the-FRITZ-Box/
• https://avm.de/service/fritzbox/fritzbox-7590/wissensdatenbank/publication/show/509_WLAN-Gerat-stellt-keine-Verbindung-zur-FRITZ-Box-her/
• https://answers.microsoft.com/en-us/surface/forum/surfgo-surfnetwork/surface-wpa3/f1cc5c1f-2756-469c-aa04-8c57b5eeb515
• https://community.netgear.com/t5/Orbi-AX/WPA3-issues/td-p/1815120