If your Mixpanel connection failed this is likely due to your Mixpanel subscription; specifically if you are using the free version of Mixpanel. Mixpanel does not offer API support for their free plan for us to grab data.
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The other most common reason that the Mixpanel connection could fail is that only the US version of the Mixpanel API is currently supported in Visible.

If you have a different Mixpanel plan and are still having issues please send us an email at support@visible.vc