Underscores in domains

[rjmcdonald83]

Summary:

Update tests to demonstrate that underscores are no allowed in domains.

PR - Merge Checklist:

-- Verify:

• ALL tests have passed
• Code Review is done
• Dependencies satisfied
• Acceptance criteria verified by QE
• End to end testing completed by QE

Dependencies:

• {db-schema/db, or other upstream repos - Add bullet points with links to corresponding PRs/tickets}

Risks:

{Risks that are associated with this merge. Things that it could possibly take down in production if released.}

Rollback:

{list steps to revert code}