Office365 account/Sharepoint online/single sign on/3rd part application

[Philiphon]

Hi,

We have create a login-system with Office 365 account for a 3rd party webapplication, hosted by our company. We would like to embed this webapp to our sharepoint communication site (online)

What we like to achieve is:

1. Login to sharepoint online with office 365

2. Once logged in, 3rd party webapp recognize the user and don't require further login.

3. Embedded 3rd party webapp show content in sharepoint online without any request

For now, we can embed the webapp in sharepoint online but it still request login with office 365 account.

Any ideas?

regards

Philip

[#2]

If you are dealing with an App hosted in your own infraestructure, I cannot think on an easy way to do this...if the App where an Azure AD registered App, this should be possible