How to find the 'Instance ID' for PowerShell Invoke-TroubleshootingPack?
You don't need to enter a 'Instance ID' for PowerShell Invoke-TroubleshootingPack

Just hit enter, when prompted for the Instance ID, without a value.

After I figured it out, I went back and looked at the training directions and found the following hiding in the middle of the paragraph.  


  you’ll be asked for an “Instance ID.” Hit Enter


I learned a lot on this journey, this was frustrating. Posting so others will find the answer sooner than I did.