Update failed client post to use url_path_for

[stephen-riggs]

Failed client posts are not currently working

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 33.56%. Comparing base (d68a67a) to head (9e00be8).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #645   +/-   ##
=======================================
  Coverage   33.56%   33.56%           
=======================================
  Files          92       92           
  Lines       11254    11254           
  Branches     1474     1474           
=======================================
  Hits         3777     3777           
  Misses       7350     7350           
  Partials      127      127           

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