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Now that we have covered sites, let's talk

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about hub sites. Hub sites are modern

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SharePoint sites that are promoted to or

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registered as a hub site. They can either

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be a modern team site or a modern

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communication site. Once you've registered

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them, the global navigation will be added

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automatically, and you can also configure

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who is allowed to add sites to the hub.

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And if you want to, you can even configure

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an approval workflow by using Microsoft

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Flow before a site is added to a hub. The

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limit at the time of recording this course

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in September 2019 was of 2000 hub sites

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per tenant. To register a hub site from

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the admin center, simply select the site

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and click the Register as a Hub Site

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button. You can then give it a different

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name. You can decide who can associate

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sites with the hub, and those can be

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direct users, security groups, or even

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Office 365 groups. To register a hub site

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with PowerShell, we can use the

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Register‑SPOHubSite PowerShell cmdlet and

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then give it the site, as well as user IDs

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that we want to allow to be able to add

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sites to this hub. If we want to add users

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afterwards that can join sites to the hub,

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we can do it via the

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grant‑SPOHubSiteRights PowerShell cmdlet

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and specify the principles and rights

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parameters. To associate other sites to a

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hub, we can use the

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Add‑SPOHubSiteAssociation PowerShell

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cmdlet, specify the site that we want to

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attach to the hub, as well as the hub site

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to which it should be attached. If you

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want to unregister a hub site, you can use

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the Unregister‑SPOHubSite PowerShell

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cmdlet and specify the site that should be

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unregistered, and it really just returns back to a normal SharePoint site.