ResourceData[] - ResourceAcquire: This request requires authentication

I am trying to follow some examples on the Mathematica website, e.g. https://www.wolfram.com/language/11/neural-networks/digit-classification.html?product=language

but I cannot get the functions ResourceObject[] or ResourceData[] to work.

in: ResourceData["Fireballs and Bolides"]
out: ResourceAcquire: This request requires authentication.


What do I need to authenticate and how? There is no mention of this, neither in the examples nor in the explanation of the functions.

CloudConnect[userid, pwd]