iTunes Connect: new test users cannot activate accounts

Hi there

I have the problem that newly added iTunes Connect users cannot activate their accounts using the link in the activation e-mail. When the linked page loads it stays white except some Angular templating instructions at the bottom. Opening the developer tools shows that a resource is not loaded from the apple server which leads to a javascript error. I already tried accessing over different internet connections (wired, wifi, 3g), but the error is always the same.

Does anybody else also have this problem?