Getting the error; WOW51900308, when trying to log in to the wow classic beta PTR. When trying to launch the game directly from the .exe I only get another error: BLZ51914503. It was working fine earlier this morning, and I can log in to the BFA client without any problems.
Edit: Looks to have resolved itself for now. I am able to log in again, but as it’s not the first time this has happened I would like to know what is causing it? Could not find a clear answer when searching up the first code on google/forums, and the other code seem to be mostly unheard of.