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https://forums-de.ubi.com/archive/index.php/t-116051.html
https://forums.ubi.com/showthread.php/1255859-Error-message-An-unknown-error-has-occurred
https://www.reddit.com/r/anno2070/comments/7w19zf/an_unknown_error_has_occurred/
https://steamcommunity.com/app/48240/discussions/0/490121928362308379/
https://steamcommunity.com/app/48240/discussions/0/882962139132254245/
https://steamcommunity.com/app/48240/discussions/0/620696934116703735/
https://steamcommunity.com/app/48240/discussions/0/135509823670447120/?ctp=1
https://steamcommunity.com/app/48240/discussions/0/1700541698705899543/
https://steamcommunity.com/app/48240/discussions/0/154643720196223890/?ctp=2
https://steamcommunity.com/app/48240/discussions/0/527274088388979091/
https://anno2070.fandom.com/wiki/Forum:Login_Screen:_%22An_unknown_error_occurred%22
https://twitter.com/hashtag/anno2070?lang=de
http://downdetector.ae/status/uplay