Starting with the newly released Windows 10 May 2019 Update (version 1903), Microsoft's operating system will discourage users from using connecting to WiFi networks with WEP or TKIP security. These protocols haven't been considered secure for many years now and future versions of Windows 10 will even go as far as disallowing these connections:
In this release a warning message will appear when connecting to Wi-Fi networks secured with WEP or TKIP, which are not as secure as those using WPA2 or WPA3. In a future release, any connection to a Wi-Fi network using these old ciphers will be disallowed. Wi-Fi routers should be updated to use AES ciphers, available with WPA2 or WPA3.