fix(auth): fixed passing in private key path

[manchuck]

Description

Motivation and Context

Testing Details

Example Output or Screenshots (if appropriate)

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (2d0b1b3) 84.52% compared to head (3f9d861) 84.61%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 3.x #920 +/- ## ========================================== + Coverage 84.52% 84.61% +0.09% ========================================== Files 122 122 Lines 1777 1775 -2 Branches 365 363 -2 ========================================== Hits 1502 1502 + Misses 275 273 -2 ```

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