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The VLAN feature is intended for LAN traffic on your RV180, in other words; behind the router. The way your ISP configure their network should not affect your PPPoE negotiation/authentication as long as the service is active, you should not configure anything in particular regarding VLAN's on your WAN setup under normal circumstances.
If you just connect your PC to the xDSL modem, can you go online? If so that means the modem is doing the PPPoE negotiation and not the RV180, and in such a case I suggest you to set the xDSL modem as bridge so the RV180 is configured to do the PPPoE negotiation and double check if PAP or CHAP authentication type to use, so instead of using "auto" set it to either PAP or CHAP as instructed by your ISP.
Notice you may also get direct support, either chat or phone, upon availability;
I have this same issue with Fibre in New Zealand. A PPPoE login in our case needs to be specified on VLAN 10. Bridge mode isn't an option and the authentication needs to happen from the router. The Huawei routers support this but not Cisco? I prefer to use Cisco Small Business equipment for our customers. Is this something in development for a future firmware update for the RV180? Happy to test a beta firmware.
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