In your Linksys router, do you have WPA3 enabled for the Wi-Fi? I have seen recently folks having success with disabling WPA3 and going to WPA2 will allow the base station to connect to Wi-Fi. I personally have experienced the flashing blue light on the base station until I enabled “legacy device support 11b” In my ubiquity access point settings. So it’s not just that it needs the 2.4 GHz Wi-Fi, there are various settings that need to be correct as well. Check the above in your linksys settings and see if that fixes the flashing light on the base.
Wpa3 reference