Last week before the reset I got the ring as 639 ilvl. This week after the reset I have gone back to the isle and did all the world quests, daily/weekly quests and side quests available. I have gone in the storm and did the meter filling quest as well. I don’t have any quests regarding upgrading the ring is showing up for me right now.
I have 6 upgrade material in my inventory but when I click it I get “This item is not customizable” prompt
Sounds bugged… I held off doing Siren Isle till recently, and it took me two hours starting it doing all available quests till capping the ring at 658 ilvl.