fix: include duplicate credentials in account linking message

[jonas-jonas]

Related issue(s)

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security vulnerability, I
  confirm that I got the approval (please contact
  [email protected]) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

[hperl]

Stellar work! 🌟

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.48%. Comparing base (6ab2637) to head (f74b961).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4079      +/-   ##
==========================================
- Coverage   78.49%   78.48%   -0.02%     
==========================================
  Files         373      373              
  Lines       26553    26563      +10     
==========================================
+ Hits        20844    20849       +5     
- Misses       4119     4123       +4     
- Partials     1590     1591       +1     

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