I think I figured it out after reading Blink camera Wifi compatibility guide. The GL-X3000 uses Wifi mode 11g/n/ax by default, but Blink cameras require 2.4G at b/g/n. So I changed routers mode to 11b/g/n and all the cameras started to work. Yippie.
https://support.blinkforhome.com/en_US/wi-fi-or-network-issues/wifi-guide
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