Hi Jing Zhou,
1.Verify regulatory domain setting and ensure that the Access Point is correctly configured.
The regulatory domain settings are properly configured then the ssid was unable to detect by the Windows 11 with an Intel(R) WIFI 7 BE200 card
2.Check access point compatibility that if it supports the 6GHz band.
The Access point supports the 6GHZ band in both Indoor and Outdoor mode.There is no compatibility issue in the Access point side.
3.Ensure that wireless drivers are up to date which may mitigate the issue.
We have upgraded our Windows 11 driver from version 23.60.1.2 to the latest release, version 23.90.0.2, provided by Intel for the Windows 11 Wi-Fi package drivers 23.90.0, applicable to Intel® Wi-Fi 7/Wi-Fi 6E/Wi-Fi 6 and Intel® 9000 series Wireless Adapters. It is important to note that in this latest version, Windows 11 with latest driver version 23.90.0.2 was unable to detect the 6GHz network when the regulatory domain is set to outdoor for the Japan country code.
4.Meanwhile you can give a test on other devices and check if it works.
In my another Ubuntu 24.04 (OS) laptop (Intel BE200 wireless card) was able to see the 6GHZ network when the Access point regulatory domain was set up in outdoor mode.
Note :The problem has only occurred with Windows 11 (laptop) and driver version 23.90.0.2(latest driver version), as indicated in the preceding comment, even though the regulatory domain parameters are correctly configured in Access Point.The Intel BE200 wireless card on the Ubuntu 24.04 (OS) laptop could simultaneously see the 6GHZ network when the access point regulatory domain was configured in outdoor mode.