To complete the Broken Awoken Talisman you need to complete all three Lost Sectors in the Tangled Shore. This gives you access to the Dreaming City. But on my second character no matter how many times I complete all three Lost sectors it won't give me the 3rd/final part of the objective. So as a result I can't get into the dreaming city on my second character.
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There are four lost sectors in the tangled shore. Two of them are in thieves landing. The lost sector you have to do there is the one playing the music.