If the first scenario applies, you might be able to see the option to authenticate your Facebook Business Manager account, but it will be disabled or greyed out (as shown below).
Using the same email address that you used to sign up for your Facebook Business Manager account, we will create a Facebook for Developers account and then create an app in order to enable the Facebook Business Manager verification button (it won’t an actual app, but a dummy).
Follow the below steps to proceed –
1. Open www.developers.facebook.com and make sure your Facebook Business Manager account is logged in before you do so.
2. To start creating your Facebook for Developers account, click “Get Started.”
3. The “Welcome to Facebook for Developers” welcome screen will appear; click “Continue” to proceed.
4. After that, you will have to input your legitimate company email address and tick the box next to Facebook’s terms and conditions. The email address you enter must match the one you used to sign up for and validate your Facebook Business Manager account.
Once you’ve entered the correct business email address, click “Send Verification Email” to have Meta send you an email to confirm your ownership of the address.
You will notice that if you have attempted this step before, you will instead see the screen below to “Review Your Email Address,” where you will have the opportunity to change your email address.
If you get this message, you must change your email address to match the one you used to register or create your Facebook Business Manager account.
As soon as you have entered the correct email address, click “Confirm Email.”
5. To verify or confirm your email address, check your email and click the verification email (or confirmation email, depending on whether you entered the email address earlier).
6. Type in the verification code from the email. If you did not get the email from Facebook, click “Send Email Again.”
7. The next step is to choose your role when creating your Facebook for Developers account. In other words, who are you joining up as?
8. You’ll be directed to a screen where you can create the app right away. To build a new app, select “Create App.” Although you won’t be making an actual app, you still need to make a test app in order to enable verification.
9. You must choose your app type after clicking “Create App”. Choose “Business” from the list and click “Next” to continue.
10. The next step is to give your app a name and input the email address you wish to be connected to it. You can choose any name for the app name, and you should ideally use the email address you used to create your Facebook Business Manager account as the app contact email (for the sake of simplicity, because more email IDs may complicate the registration process). Lastly, select the Facebook Business Manager account that is linked. Select “Create App”. You will have to enter the password to proceed
11. You will be taken to the “App Dashboard,” which is seen below. Simply take a note of the displayed “App ID” and return to your Business Settings. From the menu on the left, select “Apps.”
12. An app must now be added to your Facebook Business Manager account. After clicking “Add,” select “Connect an app ID.”
13. Click “Add app” and then paste the App ID that you copied from your Facebook for Developers panel into the appropriate section.
14. Since you are the app’s admin, your request will be immediately authorised. Select “OK.” Refresh the page now, and the added app should appear.
15. Refresh the page after selecting “Security Center” from the menu on the left, and the option for verification should appear.