I have two licences to WoW. The forums only shows my inactive account with no characters so I cannot post because I don’t have a level 10 character. I am unable to switch accounts and logging in and out doesn’t resolve the problem (as was suggested by my bug report). They told me to post here.
Have you tried a different browser? Or even a different device. I can’t switch characters on Firefox, but can on Chrome. The forums can be really buggy with regard to that sometimes.