Why have my advertising campaigns for WhatsApp disappeared and unable to link it again in Facebook after integration with WABA?

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• What should I do if receiving this error: "The namespace provided does not match the namespace associated with the WhatsApp Business Account that owns this phone number."

  Please go to the Integration at https://build.stellabot.com/integrations and check the namespace for your WABA. You could then update the namespace of your responses.  

• Can we reuse the phone number previously submitted to WABA for our personal WhatsApp or WhatsApp business account?

  Yes, please find the process of offboarding a phone number: If the number is registered with the embedded signup: 1. Head to the WhatsApp Business Account in Facebook Business Settings Page  2. Select the WhatsApp account that is tied to the phone ...