Ruijie Reyee RG-EW3000GX PRO - A Client Cannot Discover the 5 Ghz SSID of the Router

Hardware Installation and Reference Guide Common Troubleshooting
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(2) Check whether the Ethernet port is correctly connected.
(3) Check whether the router is correctly configured.
(4) Move the client closer to the router.
6.2.4 A Client Cannot Discover the 5 GHz SSID of the Router
 Check whether a 5 GHz SSID is configured on the router.
 Check whether the router is compliant with the IEEE 802.3at standard.