O365: Limit OWA to IP Addresses

Reference

https://www.o365andazure.net/azure-1/how-to-limit-web-mail-owa-access-to-an-ip-range#:~:text=We%20can%20achieve%20this%20using,navigate%20to%20Azure%20Active%20Directory.&text=On%20the%20Grant%20tab%20select%20Block%20access.&text=Now%20we%20need%20to%20open,select%20the%20Exchange%20Online%20app.

Requirements

Entra ID P1 ($6/month per user)