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As of October 2022, Messenger Page Type will no longer receive any updates.

Why is iSmartApps Removing Messenger?
Technology and customer needs change quickly, and we understand that it could impact your business.  With that in mind, we have been fairly conservative about which features we deprecate or discontinue support for.
In order to deliver new features to you - and continue to support the features you love - with the best experience possible, we need to be mindful of the tools and features that are no longer being used on a wide-scale level.
We give as much advance notice as possible through proactive communication.