Firewall rule to let network access office365 OWA

[SipriusPT]

Hello everyone,

I have a VLAN network for unprotected machines (no AV, no updates, etc), where all connections to internet are not allowed, only between networks who are behind our firewall.

Till now, I was using rules on firewall (a pfsense), to allow destinations for an alias with a list of hosts, where in that list, are FQDN.

Now I was trying to let that network access office365 OWA (https://outlook.office.com ), but doing that way, it gave me an error launched by office365:

How would you setup a rule in your firewalls to perform this?

[viktor_g]

use "Office 365 URLs and IP address ranges":
https://docs.microsoft.com/en-us/microsoft-365/enterprise/urls-and-ip-address-ranges?view=o365-worldwide