I replaced a Google Nest Wi-Fi mesh network with an Archer AXE75, using the same SSID and password, but many of my 2.4GHz devices refused to connect to it.  I tried resetting some of them to configure them from scratch, and they see the SSID but fail to connect.  I have some cameras and a few Rokus that connect fine on 2.4GHz, but a couple of my Rokus are failing, as are all 8 of my Vesync smart plugs.

I tried separating the 2.4GHz network to a unique SSID, but the same happens.  They see the SSID but fail to connect.  I also tried changing the default security, encryption, channel, and mode settings, but no combination has worked so far.

I purchased an AC1200 and put it into Multi-SSID mode, and the Rokus that couldn't connect to the AXE75 are able to connect to it.  But the smart plugs still won't connect to either one.