Can I use there IP ranges , something like 13.107.64.0/18, 52.112.0.0/14, 52.122.0.0/15, 2603:1063::/39 ?
https://learn.microsoft.com/de-de/microsoft-365/enterprise/urls-and-ip-address-ranges?view=o365-worldwide#skype-for-business-online-and-microsoft-teams