[PS-568] Fix send sync not working as expected

[Hinton]

Type of change

• [x] Bug fix
• [ ] New feature development
• [ ] Tech debt (refactoring, code cleanup, dependency upgrades, etc)
• [ ] Build/deploy pipeline (DevOps)
• [ ] Other

Objective

Resolve a defect from #771 where syncSends omitted the response.

Before you submit

• [ ] I have checked for linting errors (npm run lint) (required)
• [ ] I have added unit tests where it makes sense to do so (encouraged but not required)
• [ ] This change requires a documentation update (notify the documentation team)
• [ ] This change has particular deployment requirements (notify the DevOps team)