fix: add sms auth message to cfn template

[edwardfoyle]

Fix issue where custom sms auth message was not set in CFN template

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Merging #6789 (b037bd8) into master (697ff67) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #6789   +/-   ##
=======================================
  Coverage   56.50%   56.50%           
=======================================
  Files         430      430           
  Lines       21140    21140           
  Branches     4237     4237           
=======================================
  Hits        11946    11946           
  Misses       8381     8381           
  Partials      813      813           

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[github-actions]

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