There are a number of possible factors. The following questions may help you resolve the problem:
- Did you check the Potion's logs?
- Did you check if your action is not a duplicate? Some of third party services are using algorithm to find duplicates.
- Did you try to revoke access of your ingredient for Netvibes and then re-enable it?
- Depending on the Potion you have created, you may emit few or a lot of actions each time formula trigger. Pay attention to the frequency. Most of third party services are using automated systems to prevent spam and other annoyances. The first thing to do in automation is figuring out the best time to act. With a Date & Time trigger, you can choose a defined period of time or a specific date to emit.