Did you also try the steps mentioned in the last part of the article?
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You can also use your email address with iMessage and FaceTime. Sign in to your Apple ID account page and review all the email addresses you have on file, including the one that you're trying to verify. If the email address is incorrect, you can update it. Then click Resend next to the email address that you want to verify.
FaceTime isn't available in all countries or regions.
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copied from: If you can’t turn on or sign in to iMessage or FaceTime - Apple Support
If this does not work either, you might have to contact the official Apple Support about that, and ask them to look into your personal settings.
To do that, click on this link as a first step:
Choose your country or region - Official Apple Support