No, they will need to be represented in your tenant before they can access the site. Provision guest user accounts for them or explore solutions such as cross-tenant sync to "bring" their accounts over.
How to provide users from another Entra ID tenant access to a SPO site
We need to give users from another Entra tenant access to a Sharepoint online site.
Is it possible to have these users in a Entra ID security group and give access to these users without setting up their guest accounts in our tenant?
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RaytheonXie_MSFT 35,866 Reputation points Microsoft Vendor
2024-07-17T02:10:28.16+00:00 Hi @curious7,
Per my research, you could deploy a Microsoft Entra B2B collaboration to secure collaboration with your external partners ensures they have correct access to internal resources, and for the expected duration.
You could refer to the steps in the following document
https://learn.microsoft.com/en-us/entra/architecture/secure-external-access-resources
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