@Sater Thanks for posting in our Q&A.
For this issue, intune can support for allowing WPA/WPA2 wifi connections. We can read the following article about Wi-Fi settings for Windows 10 as a reference.
https://learn.microsoft.com/en-us/mem/intune/configuration/wi-fi-settings-windows#basic-profile
However, for the requirement that prevent users to connect to not secured connections, currently it is not supported. During my research, I find other customer who has the same requested posted in Intune uservoice as below. We can vote and post our detailed request here. This is a place to collect customers' requirements and problems.
https://microsoftintune.uservoice.com/forums/291681-ideas/suggestions/12296442-disallow-connections-to-unsecured-wireless-network
Thanks for understanding and have a nice day.
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