Error 401 calling WhatsApp Twilio APIs

I followd the guide: https://www.googlecloudcommunity.com/gc/Tips-Tricks/Guide-Twilio-WhatsApp-Message-API-WebHook-with-Appsheet-Bot/m-p/365396

But when I test my task, the message is

Why?
Do you already work on it ? any suggestion?

“401 unauthorized” seems pretty self explanatory, no? You must not be sending the correct authorization header.

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