(solved) tl;dr Changing the password of my account in battle.net solved the issue
First of all I apologize if this is the wrong place to post this in, googling the error code WOW51900314 took me to this forum.
I am unable to log in directly in the game using my e-mail and password. The game tells me that due to suspicious activity, my account has been locked and that an e-mail was sent to me with details on how to resolve this issue, but, I have not seen any mail from blizzard in my inbox.
However, by launching the game through Battle.net, I am able to log in the game without problems (since it does not ask me for anything because it uses Battle.net’s authentication).
As I could still play by starting the game through Battle.net, I did not really bother fixing this so it has been like that for a long time (at least 3-4 months), but when I have random disconnects from game or addon bugs I have to quit the game and start it again from Battle.net, and when Battle.net is down I cannot play which is kind of annoying so I’d like to fix that at once.
I have been living in a different country (Italy) than the one my account was created in (France) for a few years, because I work abroad.
When I come home in France, I have a bad internet so I often switch my network from the adsl line to mobile internet from my cellular, so, I reckon that what has been marked as ‘suspicious activity’ is most definitely me logging in from at least 3 different IPs, one of which is in a different country.
I am able to prove that the identity of the account owner is mine and I can prove that all the IPs that have accessed my account are mine but I am unsure of where and how to do this.
What can I do to fix this ? Is there any place I should open a ticket in ?
Thank you for your help.