Sandbox campaigns don't run automatically by design. This is for reasons surrounding Campaign Management, Resources, and Security.
To run a Sandbox Campaign:
Go to Support > Schedules
In the upper right-hand corner, choose the campaign type that you are currently testing. This will load the list of campaigns that fall under this category.
To the right of the campaigns, you will see a "Run Now" button. select this to run your campaign.
Disclaimer:
In an effort to supply information as quickly as possible, this article has been published prior to a formal technical review, and is subject to factual, grammatical, and various structural errors. Data may be incomplete, misordered, or incorrect.
This additional disclaimer will be removed upon formal review of this article. The standard Punchh Inc. KB Disclaimer still applies, and can be found at: https://support.punchh.com/hc/en-us/articles/360040100273-Punchh-Inc-Knowledge-Base-Disclaimer