If pressing "Send to Messenger" button won't let you proceed or the button doesn't appear, then you'll have to fix this.
Here are the steps to make it appear.
Chrome: go to Settings => Advanced Settings => click "Content Settings" in Privacy and make sure you're NOT blocking third-party cookies and site data.
If you still wish to block them: click "Manage Exceptions" and type [*.]facebook.com in a Hostname Pattern, then choose "Allow" in Behaviour.
Alternative work around
If the button still won't work for you then you can preview your survey by opening the Web links for it.
You can view the steps to do this in another article here.