I have enabled two-factor-authentication on my account, since that was recently made a requirement. Today when I tried to access https://developer.apple.com/account/, I get the following hilarious message:
"Your Apple ID currently has two-step verification turned on, but two-factor authentication is required. After you turn on two-factor authentication, signing in to your developer account will require both your password and access to your trusted devices or trusted phone number." (bolded by me)
I can login to https://developer.apple.com, and when doing so, I used the two-factor authentication, but I can't access the account-page. I have two different developer-accounts that are both having the Account Holder role, and the same issue occurs on both. None of the accounts are however connected to a physical device, so I use SMS-varification as the two-factor authentication method. I suppose this is a bug on Apples side?