I have the same problem.
I tried kr, tw, www, cn as prefix of wcl website but none of them works,
when I use www, it return "Authorization failed. The most likely cause is that the Battle.net1 API service is experiencing an outage. Try again later."
if I use https://tw.warcraftlogs.com/accounts/login/ (or kr, cn), the bnet shown me a 400 and messages about “not valid authorization type or non function with reply link” (I tried to translate to English as it is in Chinese
if you would help, it would be much appreciated.