Here is the description of transition_post_status from the codex:
This function’s access is marked as private. That means it is not
intended for use by plugin and theme developers, but only in other
core functions. It is listed here for completeness. Use any of these
functions instead.
Why not use the publish_post action instead? There is a nice article + example in the codex which covers your case. It sends an email whenever a post is published and sends the post data.
Edit 1: As @Pieter Goosen pointed I’ve looked at different function (_transition_post_status() instead of the hook transition_post_status). Please disregard my post about it’s description. Sorry for the confusion!
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