Azure Active Directory: "Access denied You do not have access" on my own account

Hi

I've just logged into the Azure portal and clicked Azure Active Directory in the left-hand menu.

I immediately got the error message

Access denied

You do not have access

I am the account owner, I created the account about 5-6 years ago and nobody else has ever had access to this account. I don't understand how I can't have access.

Any suggestions?

I don't think I've ever used Azure AD on this account but now I need to use it for a new web site that I'm developing.

Thanks