Hello there!
As I started playing WoW again in Shadowlands, I discovered that I couldn’t post bugs on the forum due to the “cant select a character” issue when logging into wow forum.
After many attempts to write tickets to Blizzard with no answer and hours spent to google my solution - a friend actually told me the solution quite recently. When googling wow forum - at least for me - it directs you to the US forums. Since I don’t play there - I don’t have a character there. This can be fixed by searching for EU wow forums or simply rewrite in the web browser by replacing us - with eu.
I’m posting this incase there are others who struggle with the same issue and cant find the solution. I tried many weird solutions suggested by reddit forums such as re-installing wow and the blizzard application (on phone).
Sincerely regards