[GH-336] - Fix Unmarshal JSON error as string

[developerkunal]

🔧 Changes

• Fix Unmarshal JSON error as string in authentication_error.

📚 References

🔬 Testing

📝 Checklist

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.37%. Comparing base (f3560ac) to head (fa97b3f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #393   +/-   ##
=======================================
  Coverage   95.37%   95.37%           
=======================================
  Files          47       47           
  Lines        7522     7527    +5     
=======================================
+ Hits         7174     7179    +5     
  Misses        232      232           
  Partials      116      116           

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