Invalid URI using Get-PSUScript after Upgrade

PowerShell Universal
1 
Product: PowerShell Universal
Version: 5.5.1

Upgraded from 4.5.2 to 5.5.1 and now receiving Invalid URI: The format of the URI could not be determined.

Get this error in an app or in the PSU Admin Terminal. Connecting from my PC in vscode to the server returns expected output.

New server install doesn’t exhibit this issue.

What am I missing?

Screenshot from admin terminal:
image

App code is simply:

New-UDApp -Content {
    Get-PSUScript
}
2

Of course after I post this, I decided to clean up the appsettings.json to match the new installation. That did the trick.