Allow multiple organizations to sign in

I’m currently trying to integrate with Okta and signing in using OAuth 2.0.

I want to know if there is a way to allow other users from a different organization to sign into my domain.

Similar to how in Azure AD, you can create an application and then allow the application and API permission to be used by accounts in any organizational directory (multitenant)

Right now it seems like only users in the current organization are the only ones that can sign in.

still curious about this

Have you looked into external identity providers and Org2Org? You can set up an idp in one Okta org that points to another Okta org, so that users from the second org can login to apps created in the first org.