If your forms aren't sending, you will need to check the settings. Go to your Forms page and make sure the form is under IN USE. If it's under DRAFTS, you will need to publish the form by swiping left on the form. Click on the settings icon to check off "Ready to send" is checked off.
If published forms aren't sending, double-check the correct settings and timings are selected.
Please refer to the following articles: