Here's what you need to input into the "OAuth Sign In URL" and "OAuth Token Request URL" fields for the Exchange ActiveSync device payload for when you need to account for modern authentication:
OAuth Sign In URL: https://login.microsoftonline.com/ENTER-THE-TENANT-ID/oauth2/v2.0/authorize
OAuth Token Request URL: https://login.microsoftonline.com/ENTER-THE-TENANT-ID/oauth2/v2.0/token
To find the Tenant ID: Go to Portal.azure.com > Azure Active Directory > Properties. The ID it shows there is your tenant ID.
Enjoy.