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Restricted domain sharing for SharePoint Online requires authentication or not?

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Hi,
Our partner at another organization has access to one of our Intranet site. They just type in the url in browser and have access without authentication, I don't know how this is set up in Network, it's probably some kind of Trust relation. Users do not need to log in authenticated to access this Intranet site.

I want to give links in this Intranet site to another site that I built in Office 365's SharePoint online site. Any way to do this without requiring users to log in using either Microsoft account or give users our AD account to log in?

It's my understanding that SP Online requires External users access but only by authenticating them as a valid AD account at our domain or log in using MS Account. https://support.office.com/en-us/article/Manage-external-sharing-for-your-SharePoint-Online-environment-c8a462eb-0723-4b0b-8d0a-70feafe4be85

I'm trying to avoid asking the users to log in if possible. Can this be achieved by using Restricted Domains Sharing described here,https://support.office.com/en-us/article/Restricted-Domains-Sharing-in-Office-365-SharePoint-Online-and-OneDrive-for-Business-5d7589cd-0997-4a00-a2ba-2320ec49c4e9 ? If not then is this possible to setup in network or program code in C#?

Thank you,
- Edited by lajasminetea Monday, November 21, 2016 11:00 PM
Monday, November 21, 2016 9:47 PM

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Not exactly. You can do anonymous sharing (share a link) which requires no authentication. You can synchronize the users from that domain to your Azure AD domain, but that will require you provide those users with SharePoint Online licenses. Or you can use Microsoft Accounts. All will require some form of authentication.
Trevor Seward

Office Servers and Services MVP

Author, Deploying SharePoint 2016

This post is my own opinion and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.
- Proposed as answer by croute1 Tuesday, November 22, 2016 3:18 PM
- Marked as answer by lajasminetea Tuesday, November 22, 2016 4:39 PM
Monday, November 21, 2016 11:31 PM

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Not exactly. You can do anonymous sharing (share a link) which requires no authentication. You can synchronize the users from that domain to your Azure AD domain, but that will require you provide those users with SharePoint Online licenses. Or you can use Microsoft Accounts. All will require some form of authentication.
Trevor Seward

Office Servers and Services MVP

Author, Deploying SharePoint 2016

This post is my own opinion and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.
- Proposed as answer by croute1 Tuesday, November 22, 2016 3:18 PM
- Marked as answer by lajasminetea Tuesday, November 22, 2016 4:39 PM
Monday, November 21, 2016 11:31 PM
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Thank you for the answer and clarificaiton.

I've been reading online but need to make sure the authentication is absolutely needed to share this Extranet SP site with our partner users (without acquireing additional licenses for them, we have the Enterprise license). These spoiled users are going to complain about logging in but it is what it is.

Many thanks again for your help.

Tuesday, November 22, 2016 4:41 PM