Hello,
Welcome to Microsoft Q&A!
Yesterday some customers reported that they failed to login to the Dev Center. This might be the same reason that causes your issue. You could open a free support ticket here: Contact Us. Choose to Contact us, select Dashboard for Topic and select Account setup and management for issue type. Then the store team could help to check your account.
And another thing is that currently, Microsoft Q&A only supports topics on the right side. Your question is more related to the Dev Center. It would be better to ask here: Publishing Windows Store apps Forum.
Thank you!