In order to create a permanent token to send Authentification message to your users your are invited to follow the steps as described in the official Facebook post https://developers.facebook.com/blog/post/2022/12/05/auth-tokens/ in Creating a Permanent Access Token section. However you may face the following issues

Access will be updated. is already assigned to selected Pages. Their access will be updated.

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Most of the answers on a Google search will lead you to the Business verification section or to validate your business email. Like in the following video and blog post:

https://www.leadsie.com/blog/unable-to-assign-assets-meta

https://www.youtube.com/watch?v=f1oYUPygo2Y

If you’ve followed theses steps and you are still blocked, the solution is in the Security Center page. You need to select the App requires access to permissions on Meta for Developers option in the Select your verification use case drop down in Business Verification section

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You will then see a prompt that will ask you for a verification code that you will receive by email.

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Enter the received code and validate.

Visit the System users page and click on Generate Token, you will now be able to generate the permanent token without problem.

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