Make sure you're using the API key for an admin user in FUB, not an agent user. To fix this, you'll want to reconnect your account. You can do that by going to [the connected accounts page] (https://zapier.com/app/settings/authorizations) and clicking the reconnect button, then entering your admin user API key.
Error: We could not find the tag
When setting up a Zap using the "New Tag Added to Contact" trigger, make sure you add the tag to an existing contact in Follow Up Boss right before you test the trigger step.