Welcome and thank you for posting your query on Microsoft Q&A. From above description I could understand that want to know how to enable SSO with salesforce for Azure AD users whose account domain is different from your AAD domain.
Please correct me if this is not the case by responding in the comments section.
- You may try to have the users added in Azure AD as B2B Guest users.
- Once done you may follow the tutorial to try the SSO configuration.
Please do let me know if you have any further queries.
Thanks,
Akshay Kaushik
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