I am having problems with the integration. It seems to not be working. I was able to sync up with my battle tag id but it does not find my character or my guild. Please help

You needed to grant WCL all the permissions. Go to your account page and under authorized apps revoke WCL’s access. THen unlink and relink on the site and this time make sure you check everything.

I’ve done the steps of what you say,but it still not work.
Is there any problem to get CN character information?

Blizzard took the APIs down in the CN region. Nobody knows why.