What do I have to do to enable CloudEvaluate?

Questions
1

First time trying things on Wolfram cloud. Long-time Mathematica user.

Any attempt to use CloudEvaluate[] returns CloudEvaluate::srvfmt : "Wolfram Cloud returned an unexpected response. Please try again later. " E.g.:

    In[394]:= CloudEvaluate[2 + 2]

During evaluation of In[394]:= CloudEvaluate::srvfmt: Wolfram Cloud returned an unexpected response. Please try again later. >>

Out[394]= $Failed

I’m certain it’s something pretty simple, but for the life of me I cannot figure out what it is. CloudPut[], CloudGet[] work so what gives?

2

A good question. I see this with some calls to CloudEvaluate, but not with simple calls like John made above.

I have a single computation (function call) that runs out of memory on my 8GB M1Air. I would like to run it in the Cloud. Documentation as to issues, cost, best practices is sparse.