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Once you dont you can revert your changes. (i am not sure you can change the url on Office 365) take the backup of site collection, restore with different url…mark the old site as no access…do the work on restored site, once done…restore that site on old and let the user access it.
How to block a specific user from accessing SharePoint?
1 Open the SharePoint Admin Center. 2 Expand Policies > Access Policies. 3 In the Unmanaged Devices section, select Block Access and select Save. 4 Open the Azure Active Directory portal and navigate to Conditional Access Policies. 5 Update the policy to target only specific users or a group.
Find the person you would like to uninvite to the site, and click the ellipses . . . to open the menu. In the properties window, click Withdraw. If the external user has already accepted an invitation, and you want to remove their access, you can do so by removing them from the SharePoint permissions group to which you assigned them.
How to disable access to Microsoft 365 services?
However, you can control the Microsoft 365 services that the user can access. For example, even though the license allows access to the SharePoint Online service, you can disable access to it. You can use PowerShell to disable access to any number of services for a specific licensing plan for: An individual account. A group of accounts.
On the Manage Quotas and Locks page, click Manage site collection quotas and locks. In the URL of Top-level Web Site section, type the URL in the Enter the top-level Web site URL box, and then click View Data. In the Site Lock Information section, select Not locked, and then click OK. I LOVE MS…..
How to temporarily disable a SharePoint site collection?
Using Set-SPOSite, you can lock down the Office 365 site collection with the LockState parameter. Optionally, Set-SPOTenant can be used to redirect users from the locked site to another location. I don’t think their is any lock type available which will disable all users from the site collection except Site Admins.
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