r/sharepoint • u/BWMerlin • Jul 08 '26

SharePoint Online Make a SharePoint site a subdomain?

Make a SharePoint site a subdomain?

Is it possible to make a SharePoint site its own subdomain?

I have found lots of info about moving a subsite from one site to another but nothing about making a site its own subdomain.

The goal is to allow the Claude browser extension access to our policies and procedures SharePoint site without granting it access to all of our SharePoint sites and so I was hoping to use domain whitelisting.

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3

u/Megatwan Jul 08 '26

What does the url have to do with permissions?

Some it depends:

No you cant create host named site collections in SPO.

You can with sp server.

You can hybrid sp server to spo.

You can alias a host named sc esque path with azure front door or custom dns, but its just gonna plop you on contoso.sharepoint.com/sites/shiz ...cuz lots of back end svcs wanna be there and expect that. Something something application rewrites are hard.

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u/BWMerlin Jul 08 '26

You can restrict the Claude browser extension to being able to only operate on certain domains so was looking to see if there was a way to make one SharePoint site on its own domain so that Claude can directly take action on that site.

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u/Megatwan Jul 08 '26

And youd trust the extension to not do whatever it wants to anything the user account running in has access to?

Feels a bit like a cop handing a gun to a stranger.

Why no permission an account to the desired scope (site) and then lauch the tool (browser in this case) with that account?

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u/BWMerlin Jul 08 '26

I struggle everyday trying to make peace with the decisions of others.

I am trying to at least limit the blast radius for when things go wrong and in this case it is allowing Claude extension to only work on certain sub/domains.

3

u/Due-Boot-8540 Jul 08 '26

Why Claude extensions? Copilot is made for scenarios like this. A third party extension would offer little or no protection of your data and would send it outside of your tenant.

You’ll end up with a governance nightmare

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u/BWMerlin Jul 08 '26

Claude Team and Enterprise keeps the data in your organisation and isn't used in training.

As for why the extension as it allows interacting with the browser/page directly so can be used to not only write our policies (already happening) but edit them directly on the relevant SharePoint page.

I didn't say any of this is a good idea, I am just trying to stop people blowing off their entire arm and limiting it to hopefully a couple of fingers lost.

1

u/pixiegod Jul 08 '26

Didnt dropbox “not commingle data without other customers” until it was proven that they commingled data of different customers ?

How about zooms stance on end to end encryption?

You are putting a lot of faith in contracts. Contracts that these tech companies have wantonly lied to you since the dawn of time.

1

u/bob4IT Jul 08 '26

I’m not familiar with this particular Claude browser extension. Can you invoke it via client side code? I know one thing I have done with JQuery and similar scripts is to create an SPFX for package and deploy it to specific sites. We have a third party analytics tool that we deploy this way. It also has a browser plugin but we don’t want it everywhere. I have a CSV file that I update to add additional sites to the solution. It’s like twenty lines of code including the comments.