Add permission to all authenticated users

Question

I have a Site Collection in our SharePoint online tenant. I wanted to give Read permission for everybody in our organization. so in Site Permissions I Clicked on Grant Permissions and typed NT AUTHORITY\authenticated users and clicked ok. However nobody has access to the site collection yet. I thought I have to add NT AUTHORITY\authenticated users to the members group but still nobody has access to the Site Collection.

Answer 1

You can provide permissions to following groups :

1. All Authenticated Users: All user accounts which can be recognized by SharePoint Online, both for internal and external.

2. All Users (Windows) : User accounts from Federated domains.

3. All Users (membership): All user accounts from Office 365 Online Services.

Answer 2

Everyone was what worked for me

EDIT Everyone is a default group that contains all authenticated and guest users that can connect to your network.