Here are some configuration guidelines from the Peplink Surf Soho manual:
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Outbound Policies are applied only when more than one WAN connection is Active. Hopefully the Dashboard shows both as WAN (T-Mobile) and WAN USB (Verizon) as WAN Connected and active for you.
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The Soho supports Enforced and Priority outbound policies. You should probably enable “Terminate Sessions on link recovery”. Otherwise, a session can remain connected on the wrong WAN. See: https://forum.peplink.com/t/one-way-audio-on-soho-surf/23073/9.
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I don’t know if “Independent from Backup WAN’s” needs to be enabled, but probably. Same thing with Standby State. It may need to be configured so that the connection remains connected, not disconnected when the WAN connection is no longer in the highest priority and has entered the standby state.
I don’t know how re-arranging Priority on the Dashboard affects the priority you select in the Priority Outbound Policy (I no longer have a Surf Soho, but have ordered one to arrive in a week or two). I am assuming that the priority order you set in the Priority Outbound Policy is unaffected. And does that mean that anything in the Outbound Policy list is executed before the Priority settings in Outbound Policy or the reverse, with the Dashboard settings superseding the Outbound Policy which seemed to be your experience (but were the two WAN connections active as required to execute Outbound Policies…)? Hopefully someone can clarify this.
The Enforced Outbound Policy seemed to behave much more as I expected with the exception that the YouTube app on your Apple TV misbehaved. I wonder if this could have something to do with the configurations which I mention above, particularly “Terminate Sessions on link recovery”. Another thought which occurred to me is whether Apple or YouTube tries to connect back via an Inbound connection. It seems like a remote possibility unless there was Port Forwarding going on. But then again, FTP transfers can do this. Again, maybe someone can lend assistance on this.
Finally I will comment that you got further than I did on Enforced connections in 2018 using WAN USB. I wonder if that is because you had WAN USB at Priority 1 or Priority 2, not Priority 3 on the Dashboard (I can’t remember anymore what I did). Perhaps Priority 3 is always reserved for Cold Standby so that you can only have two Active connections. Another difference is that I was using WAN USB with a USB to Ethernet adapter. Probably Peplink (@TK_Liew?) would be best to comment.