Hey @abarazal
I see you’re a developer for a public app Tracking Time - please do open a ticket with our Platform Support team from https://developer.zapier.com/contact for this issue so we can take a look at the specific setup for your webhook trigger and the audit logs for the Zap you’re testing with.
As long as your subscribe and unsubscribe urls are configured: https://platform.zapier.com/docs/triggers#subscribe - a Zap with the Time Entry Updated trigger selected, for the applicable TrackingTime version, would be expected to call the subscribe when turning on / publishing the Zap.
So we can take a closer look at the logs with you, please open a Support ticket for your public app integration