fix(Authenticator): fix sms no challengeName

[esauerbo]

Description of changes

Fixes #5067

Issue #, if available

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• Have read the Pull Request Guidelines
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• Relevant documentation is changed or added (and PR referenced)
• yarn test passes and tests are updated/added
• No side effects or sideEffects field updated

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[reesscot]

LGTM, tested that SMS MFA flow is working correctly now