Workspace Identity not authenticating to Invoke Pipeline

Hi KimMW, 

What you're doing should be working to the best of my knowledge. 

I just tried this in my enviornment, and it works without issue. 

My setup: 
One pipeline that sends an email and triggers the second pipeline
the second pipeline just sends an email

The connection in my invoke pipeline activity looks like this: 

And this works without issue. 

Note that if the workspace identity only has viewer, I do get the error you are describing. 

But your workspace identity does have contributor, which works on my end. 

Are you able to make a new pipeline and test it? I wonder if there is something weird with your existing pipeline. 

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