[2019] Can't even play the game anymore thanks to "Failed to retrieve your character's progression data" Errors.

So yeah, I haven't been able to play Dauntless at all this evening/night when everything was perfectly fine 2 days ago.

Description of the events:

I could play fine 2 days ago. Yesterday I started getting this "Failed to retrieve your character's progression data" Error message after more and more hunts when it reached a point where I got it after about each and every hunt, making me having to go through 2 loading screens after each match. It was quite frustrating. To make matters worse, tonight, I not only still got that Error after each hunt but I also started getting it when I tried to login (or relog back in) to play. After a couple of tries I'd manage to finally get (back) into the game but with so much time wasted on loading screens I was rapidly losing patience. Finally, the final straw happened... Now it's every god damm time that I try to login that I get this stupid error so I cannot even play the game anymore.

Screenshot of the Error Popup: https://cdn.discordapp.com/attachments/466060592646455308/597232984252219393/DntError.png

Reproduction Steps: Open the game -> after "Logging into Dauntless" I click on the "Play" button -> (long) Loading screen -> Error message and back to main menu. This error would also happen after every single end-of-hunt screen (so during the loading screen which should bring me back to town after each hunt).

Operating System and specs: Windows 10 PC with RTX2070 + i7-8700K + 16GB of Ram.

What I tried (and obviously nothing succeeded in fixing my issue):
-Opened my firewall(s) to "Dauntless.exe" and "Dauntless-Win64-Shipping.exe".
-Opened the ports for Dauntless (8999​-​9999 and 5269).
-Turned off my antivirus.

I need help with this. Otherwise I'll simply uninstall as I cannot even play the game at all, at this point, and am extremely close to running out of patience.