1.Log into your Facebook Business account, and click brand safety > Domains > add

2. Fill in the Domain Name field with your custom domain and click Add Domain.

3.Download the HTML verification file and follow the instructions to verify your domain.

4.Log in to Lihi.io and go to Manage Domains, find the domain you want to verify and click Upload Facebook Verification File. Locate the HTML file from Step 3 and upload it to finish the verification process.