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I use ModernUI in SharePoint Online.
Is it possible to temporarily disable the system for release work, site updates, etc., except for operational administrators?
I also want to prevent users who have registered their browser's favorite sites from directly accessing the URL.
It would be great if I can display message like "Site is under maintenance".

Appreciate any ideas\Pointers. Thanks,

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To answer your questions:

  1. It is not possible to disable the system for getting release from ‎Office 365‎, it is only supported to control what release we may receive. You will have to contact Microsoft for further control on your behalf.

  2. You can set a site to Read Only using PowerShell:

    Set-SPOSite -Identity <siteURL> -LockState ReadOnly

    It will display a message on top of the site that it is under maintenance and read-only, but it will disable the activities on all users who have access, including Administrators. Also it doesn’t apply to the root site collection.

    As a workaround, I would suggest you restrict user access by adjusting user permissions directly.

  3. We cannot prevent users from accessing a site via the URL (or following the site) as long as they have access to it. See a related post here: How can you prevent users following your site?

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  • Thank you for your answer. I understand very well. I have one question. If I set the site to ReadOnly with powershell, is it possible to update data with PowerAutomate without directly accessing SharePoint?
    – Hyonta
    Sep 30 '20 at 7:36
  • @Hyonta I’ve just ran a quick test using flow, and it returned an “Access is denied” error. So the answer is no, flow would not be possible either. Sep 30 '20 at 7:58
  • Thank you for investigating.It helps me. Thanks a lot.
    – Hyonta
    Sep 30 '20 at 10:36
  • What do you think about the lockdown mode described on this site? Does this meet my requirements? sharepointdiary.com/2018/06/…
    – Hyonta
    Oct 5 '20 at 9:36
  • @Hyonta I'm afraid not. The Limited-access user permission lockdown mode Feature is used to assign "Limited access" permission in a site. It will restrict but not disable user access under several circumstances. That would be a different topic. Oct 5 '20 at 23:40

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