@EA_Shepard Yes, I'd like to create a case, but don't know how. I can only find the chat option but the form always says "this page has timed out. Please refresh and try again"...
As for the errors, I probably should have written them all down. Most of the ones I reported here were abbreviated, like 10066 had another five numbers, I remembered those specific numbers because I googled the error codes I was getting and started abbreviating them when I realized there wasn't a single web page with the long error codes on them. The lastest error code I got was "EC:-2147456313" (Report ID 02a1eaa0-ea5a-4392-be47-f695a978caa3) and I've been getting negative numbers lately. I reported 90+% of them tho, if that helps, all with the same description so it might be easier to link to each other (unless they were all filtered as spam because of that lol).
A connection issue would make sense if that causes "ActivationUI" to do nothing and that in turn crashes the EA App so I can't launch any other game after the fact. But why would my internet connection (that's stable in all of my online games) fail 100% of the time on Inquisition and only Inquisition? Still, I will experiment with a different network and hotspots.
Since the last suggestion I have also checked and repared the installations of Visual C++ and .NET Framework, making sure I have all versions available. Just in case that's the thing that's failing. But my money is still on the activation process just failing...