I heard about the addition of PoSh as a kernel for notebooks in Azure Data Studio. This is in the November 2019 release, and you can download/upgrade today to get the feature. I started ADS, let it download the update, and then ran the install.
As soon as ADS installed, I created a new notebook, and added a code cell. I saw Powershell in the kernel dropdown. Sweet!
I selected this dropdown and saw this:
Hmmm, maybe I picked the wrong one. I tried this again and got the same result. I checked, and I have Python installed, but apparently not a version compatible with ADS.
I restarted ADS. Same thing.
I restarted my computer; same thing. I saved the notebook, added other cells, did a few things and got the same result.
At this point, I suspected that the developers of ADS had all installed Python as part of their core image for ADS. So I clicked “install Python”. Once this completed, which took awhile. Once this was complete, and the kernels reloaded, PowerShell notebooks work.
Aaron Nelson published a post about this, with more details on how to get the kernel working. To me, this is a bug, as the message should tell me Python is needed for the PoSh kernel.
Voice of the DBA 
This is for powershell though. There isn’t good verbiage that explains why or that python is needed to activate posh.
I do have python 3.x installed as well. Not sure why this wasn’t picked up or if the version is old but it’s a strange and poor design of the ux
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