I'm on my first character, and after I completed all “Abyss One: The Magnus” main quests, talked to Yeonhwa at the Velia docks. I then completed [LoML] Snotface Wants To See You, and I show "[LOML] To the Land of the Morning Light" as my active quest. But I have no option to use the LOML portal in the Magnus.

I have tried relogging, and forfeiting and re-accepting the "[LOML] To the Land of the Morning Light" quest.

What flag is missing? I don't want to have to use the ferry and should be able to use the Magnus well to get to LOML now according to what I've read.

I have the [Title] "Linked Up Morning Light" and everything, so something is definitely busted. The portal for LOML in the Magnus is also glowing like it should work. Any advice welcome.

Are you sure it's the correct LoML Portal.... there are two, The one for that quest is Nampo

alternatively, if you've discovered anyplace in LoML, you can just use map transport for the character, and complete the quest that way by talking to Yeonhwa at the the Nampo dock (Seoul is free, anywhere else is 5mil)