Make sure that the user is removed from the site collection.

Note: If errors continue to affect a guest account, we recommend that you remove the guest account from the Microsoft 365 admin center completely. Then, grant to the user permissions to the file or site. If the user continues to receive an error message, remove the user from the site. If the user doesn't have appropriate permissions, grant the user permissions to the file or site.

Review the permissions that the user has on the site, and also check the related security group (if applicable).

In the User/Group field, enter the user's name, and then select Check Now.

In the ribbon, select Check Permissions.

Verify the permission by using the Check Permissions feature: A user can't access a SharePoint site or another user's OneDrive siteĭetermine the permission level that the user should have on the site. To fix the access issues manually, follow the steps for the relevant scenario. The diagnostic performs a large range of verifications for internal users and guests who try to access SharePoint and OneDrive sites. Resolution option 1: Run the Check User Access diagnostic

The mismatch can also occur during directory synchronization between an Active Directory organizational unit (OU) and SharePoint if users have already logged in to SharePoint and are later moved to a different OU. The new account is assigned a new ID value even though the UPN is the same. The ID mismatch usually occurs if a user account is deleted from the Microsoft 365 admin center, and then a new account is created by using the user principal name (UPN) that was used by the deleted account. The account that's used to access the shared link is different from the account to which the sharing invitation was sent.Permissions for the affected user aren't configured correctly.These errors can occur for various reasons, such as: To try a different email please sign out and open the link again. Sorry, you are currently signed in as but that account is not on the list of people this is secured to. When users try to access links to files or folders that are shared by other users from SharePoint Online or OneDrive sites, they receive the following error message: You need permission to access this site.When users try to access a SharePoint Online or OneDrive for Business site, they receive one of the following error messages:

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