Setting Up Connector to Archive Facebook Data

Good morning!

I'm following along this guide from Microsoft (https://docs.microsoft.com/en-us/microsoft-365/compliance/deploy-facebook-connector?view=o365-worldw...), it's walking me through how to setup a connector from Azure to Facebook so that we can archive page data from our Business Page.

I'm stuck on Step 3. I'm not sure what it means when it's talking about Valid OAuth Redirect URIs or the  Webhooks Callback URL... where does this information come from? It wasn't necessarily clear in the tutorial.

The first few steps went great... anyone have some insight on how to get past Step 3?