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Also have Magenta as provider here in Austria and the same problems. For me it worked when i connected with a VPN.
Same problem for me since yesterday. When i start the game i get the small splash screen and after a while i get the error code: 0 Location: Austria
For me the trick with the custom resolution worked perfectly. Set it to 5760x1080 in the nvidia control panel and then posted the triple screen...
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