Office has blocked this content because it uses a sign-in method that may be insecure

Park, Dave 26 Reputation points
2021-03-24T16:30:33.737+00:00

Opening recent files from a SharePoint 2019 environment with Office apps is giving the following message:

81283-sp2019recentfilemessage.jpg

Going into the Office trust center and adding the SharePoint 2019 site to the trusted host, the file can be opened. Is this the fix or is this just a temporary fix? Noticed that files in SharePoint Online, there is no issue opening the recent file from the Office app. What is different in authenticating the user to the on-prem SharePoint 2019 which causes this? Would this also cause issues authenticating opening and saving files from/to the SharePoint 2019 environment? Users are having occasional issues when files cannot be opened or saved with login windows flashing several times and access denied.

SharePoint Server Management
SharePoint Server Management
SharePoint Server: A family of Microsoft on-premises document management and storage systems.Management: The act or process of organizing, handling, directing or controlling something.
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  1. ChelseaWu-MSFT 6,316 Reputation points
    2021-03-25T06:43:55.383+00:00

    Hi @Park, Dave , thank you for posting in the Q&A forum.

    This is the fix for running into this error while trying to open files from untrusted locations using Office client. Adding SharePoint site (or IP address of shared file server) should permanently solve the issue.

    Just in case you have configured Form-Based Authentication for SharePoint Server 2019, here is a reference on additional settings: Did you know: there is an updated feature restricting form-based authentication in Office apps.

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  2. Martin Ericssson 21 Reputation points
    2021-04-22T06:50:15.167+00:00

    Hi,
    I'm facing the same issue with the blank SSO sign in page. We are using Azure App Proxy together with SP2019 and SSO via KCD.
    All worked just fine before. Are there any extra steps to resolve this?
    I can see that the https://login.microsoftonline.com is showing and trying to perform SSO. Seems to work and then a blank page with the title of my SP URL is shown.
    In the Azure sign-in logs I can see an interrupted sign in.

    @Park, Dave @ChelseaWu-MSFT were you able to resolve it?

    Thanks!
    Martin

  3. Brad Johnson 1 Reputation point
    2022-10-12T00:39:48.33+00:00

    we have error also
    sharepoint on prem - 2016
    office LTSC 2021
    opening a word document link from sharepoint site provides error
    249514-image.png

    if i open trust center, it takes me to trusted publishers, and has the line highlighted in screenshot
    249475-image.png

    i have added our sharepoint server to the trusted locations? - how do i add to trusted publishers?

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