In the off chance your Meta inbox stops showing, acting up or you just need to re-add it for any reason, please follow these steps:
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Go to Settings > Inboxes > delete Meta inboxes 
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Double check that Commslayer is disconnected in Meta Business following these steps: https://www.facebook.com/business/help/244775880105932?id=1918810491484845 
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Recreate the meta inbox and click the blue link in the image to double check that all assets are included 
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Click Reconnect 