fix: broker auth is not available after packed (#15778)

[HuihuiWu-Microsoft]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.95%. Comparing base (97a8fa4) to head (0fa0fd2).
⚠️ Report is 2 commits behind head on release/6.8.

Additional details and impacted files

@@              Coverage Diff              @@
##           release/6.8   #15788    +/-   ##
=============================================
  Coverage        92.95%   92.95%            
=============================================
  Files              623      623            
  Lines            38445    38445            
  Branches          7116     6941   -175     
=============================================
  Hits             35737    35737            
  Misses            1977     1977            
  Partials           731      731            

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