If your links go out without being shortened by your shortners, it can be extremely devastating. If you've already set up your shortner before, whether it's Bitly, Rebrandly or TinyURL, there are few possible reasons why that happened:
1. Monthly limit: You've used up your shortner's monthly link credits. While Bitly and Rebrandly obviously have a monthly limit for their links especially in their free plan, TinyURL doesn't. Although Bitly is more widely used by Contactreach users. If using Bitly or Rebrandly, check if you still have credits for the current month. If not, you can either purchase a paid plan, or (not recommended) switch to TinyURL.
2. Shortner Access Token Error: Just a single character error, whether a typo, mistyping, etc., will cause the disconnection of the software to the shortner, so the shortner will not work. In this case, you need to go and copy your shortner's access token again and paste it in your Contactreach settings.
3. You forgot to set it up at all: If by any chance, you realized that you haven't really set it up, then go to your Settings right away and open up Other Settings then scroll down until you find your shortner election.