My number that I generated on Manychat is not being approved on Facebook Business. I think it's related to the country of address of my business, which I fill in with the country from which the number was generated US +1 (United States). However, I'm from Brazil. Can you help me, please? 
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Same my watts app I can't open
I’m having a similar issue with my setting up my WhatsApp Channel. I’m stuck on the facebook authentification . Anyone on support here to help out ????
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