Hi ApexSystems,
I understand you encounter the issue that the external users cannot access your SharePoint site. Actually, the external users’ accessing will not go through ADFS authentication. To verify whether the issue is related to SharePoint external sharing service, could you follow the steps below and provide relevant results?
1. Prepare a live.com external user (I suggest you click here to sign up for a new one.) and a non-ADFS network environment.
2. Have the external user access the shred SharePoint site via the In Private Internet Explorer in the non-ADFS network environment.
3. The user should be requested to login. Enter the live.com account as shown in the following screenshot.
4. Then the user should be redirected to the Windows Live authentication page. Enter the password and click Sign in.
Even if the external user is not successfully shared, the error message should be an Access Denied one rather than an ADFS-related error. Could you follow the procedure above and provide the results from your side?
Additionally, the following information would also be helpful to the troubleshooting. Could you provide it?
Does this issue occur if you share other SharePoint sites? Please also have the external user follow the procedure above.
Thanks,
Kevin Cui