A notebook, smartphone, or other wireless device only establishes Wi-Fi connections to the FRITZ!Box with WPA2 although "WPA2 + WPA3" was selected as the Wi-Fi encryption in the FRITZ!Box.
Simply proceed as described below. After each measure, check whether the problem is solved.
1 Installing the latest software for the wireless device
Install the latest software version for the wireless device (for example Android, iOS) or the latest driver for the computer's wireless network adapter (for example from the Intel Download Center).
Note:Refer to the device's manufacturer for information on how to update, for example consult the manual.
2 Reconfiguring the Wi-Fi connection
After changing the encryption to "WPA2 + WPA3", some wireless devices do not connect to the FRITZ!Box with WPA3 until the Wi-Fi connection is reconfigured:
Important:Do not use WPS or a QR code to set up the Wi-Fi connection. When WPS or a QR code is used for setup, wireless devices usually use WPA2 and not WPA3 for the connection.
Windows
Click (Start) and then (Settings) in the Windows task bar.
Click "Network & Internet" in the "Settings" menu.
Click "Wi-Fi" and then "Manage known networks".
Click on the connection with the Wi-Fi network name (SSID) of the FRITZ!Box and then click "Forget".
Click on "Network" in the "System Preferences" menu.
Select the option "Wi-Fi" in the left-hand window.
Click "Advanced".
In the "Wi-Fi" menu, select the connection with the Wi-Fi network name (SSID) of the FRITZ!Box listed under "Preferred Networks" and click the minus sign.
If the Wi-Fi connection is still only encrypted with WPA2, the wireless device does not support WPA3. Although WPA3 is supported by devices with Wi-Fi 6, it is not supported by many older wireless devices such as:
Android mobile devices with Android older than version 10
Apple iOS devices with Apple iOS older than version 13
Apple Macs with macOS older than version 10.15 (Catalina)
Windows computers with Windows 10 older than version 1903
Refer to the respective manufacturer for information on whether your wireless devices support WPA3.
Note:In Windows you can enter "netsh wlan show drivers" in the CMD command prompt to determine whether the computer's Wi-Fi network adapters supports WPA3.
A migration from WPA2 to WPA3 is not simple. Organizations may need to update their hardware extensively to accommodate the newer Wi-Fi encryption standard. Wi-Fi Protected Access, or WPA, is a security standard for wireless LANs that encrypts data packets as they are transported or received across the Wi-Fi network.
Make sure that the protocol you choose is compatible with your devices. Choose WPA2 if your network does not support WPA3. WPA2 uses strong encryption and security features, and it is supported by most devices used at home and in corporate environments.
Backward Compatibility: WPA3 is not backward compatible with older devices that only support WPA2. However, most modern devices and routers are being manufactured with support for both WPA3 and WPA2, allowing networks to operate in mixed mode to accommodate older devices.
Select WiFi from the navigation at the bottom of the screen. Select your network. Select Edit WiFi settings from the pop-up card. Use the drop-down menu to change your Security mode.
Set to WPA3 Personal for better security, or set to WPA2/WPA3 Transitional for compatibility with older devices. The security setting defines the type of authentication and encryption used by your router, and the level of privacy protection for data transmitted over its network.
Find the Wi-Fi connection icon in the taskbar and click on it. Then click Properties underneath your current Wi-Fi connection. Scroll down and look for the Wi-Fi details under Properties. Under that, look for Security Type, which shows your Wi-Fi protocol.
Although WPA3 is supported by devices with Wi-Fi 6, it is not supported by many older wireless devices such as: Android mobile devices with Android older than version 10. Apple iOS devices with Apple iOS older than version 13. Apple Macs with macOS older than version 10.15 (Catalina)
But does WiFi 6 require WPA3? The answer is no for WiFi 6 devices operating in the 2.4 GHz and 5 GHz bands, where WPA3 is optional. However, for WiFi 6 devices in the 6 GHz band, WPA3 is mandatory. So, if you want to take full advantage of WiFi 6E, a WPA3 setup is recommended.
When choosing from among WEP, WPA, WPA2 and WPA3 wireless security protocols, experts agree WPA3 is best for Wi-Fi security. As the most up-to-date wireless encryption protocol, WPA3 is the most secure choice.
Introduction: My name is Kerri Lueilwitz, I am a courageous, gentle, quaint, thankful, outstanding, brave, vast person who loves writing and wants to share my knowledge and understanding with you.
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(Start) and then 
(Start) and then 
(Settings) in the Windows task bar.