NOTE: This works. We have just tested it.
Hi Just went through this. Facebook support was very unhelpful honestly. This is the workaround that worked for me
- Make sure you have completed your business information on the settings -> About section of the business manager page
- Turn on 2-factor authorisation for your admin users
- If the option still doesn't appear - go to the facebook developer page and create an app - https://developers.facebook.com/apps/
- Associate the new app with your Facebook Business Page
- In your App dashboard - go to settings and basic and scroll down to business verificatio
- Click on verify here - for some absurd reason it works! - you will need to upload tax documents etc to verify
Hope this helps
Facebook verify my business button grayed out - how to Enable?