I am having the same issue as well. I did 2 adventures that I haven’t done before and then when i refreshed the app, they still were not complete on the app bit were finished last night in game
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I figured out that the adventure have to be done on the same character. So it appears to be a bit of a typo in that it should state 20 adventures on one character. So try that it worked for me. Also as to my issues with the regional chests it seems that the website and app were telling me I was missing the wrong chests. I went on my warlock who had not collected any of the chests. The moments of triumph were telling me that I was missing 2 chest in hellas basin on Mars, but did not complete until I collected chest in the Futurescape area of the map.
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Ahh omay that explains it. I did those on my hinter i believe and my titan is my main. I will try that tonight to see if that does indeed fix the issue