Service Principal Support

[saimachi]

Service Principal Support

The issue or feature being addressed

This PR allows Service Principals to call Core & Management API.

Confirm the following

• [ ] I started this PR by branching from the head of the default branch
• [ ] I have targeted the PR to merge into the default branch
• [ ] I have included unit tests for the issue/feature
• [ ] I have included inline docs for my changes, where applicable
• [ ] I have successfully run a local build
• [ ] I have provided the required update scripts, where applicable
• [ ] I have updated relevant docs, where applicable

[!NOTE] Instead of adding X's inside the checkboxes you wish to check above, first submit the PR, then check the boxes in the rendered description.