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The original was posted on /r/ubiquiti by /u/Parking-Bank-4645 on 2023-08-31 20:43:23+00:00.

I have my UDM Pro set to have failover internet to port 8. I have the Netgear mobile router plugged in that shows ATT 5G service running, but Unify shows that secondary internet is down. I have tried it on passthrough mode and normal operating mode. I can’t figure out where I am going wrong. Any ideas?