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The problem comes when this other administrator tries to access the SharePoint Admin Center in SharePoint Online and the cannot access it but I have no trouble accessing that site. Where could I look to see where the difference might be between the access/rights I have and this other user has? Thanks in advance for the assistance.
If you can’t access the site as the incorrect external user, follow these steps: As a SharePoint Online administrator, sign in to the site collection that was shared with the external user. Select the gear icon for the Settings menu, and then select Site settings.
How to check the site permissions in SharePoint?
To use the Check Permissions feature, navigate to the User.aspx page by selecting the gear icon in the upper right corner, then Site Permissions. In the flyout, select Advanced permissions settings. For example, the full URL will resemble the following: https://contoso.sharepoint.com/_layouts/15/user.aspx
What to do if you do not have permission to access a site?
The type of permissions the user has on a site and which security group it is derived from (if applicable) will be displayed. If the user does not have appropriate permissions, grant them permissions to the file or site. If the user continues to receive an error message, remove them from the site using the following steps:
Microsoft Partners can’t access the new SharePoint admin center. Some functionality is introduced gradually to organizations that have opted in to the Targeted release option in Microsoft 365. This means that you might not yet see some features described in this article, or they might look different. Help us improve the new SharePoint admin center!
The new SharePoint admin center refers to site collections as “sites.” On the site collections page, select New > Private Site Collection. Active sites page > Create: In the new SharePoint admin center, you can create Microsoft 365 group-connected team sites and communication sites, as well as classic sites.
Is the port number for SharePoint central admin the same?
Since you re-installed SharePoint, you can try and see if the port number for central admin is still the same by running: in SP2010 Management Shell. Renaming a computer with Sharepoint on is never a good idea and even though you renamed it back I suspect a SID is stored somewhere in your config database.