Dear @F¡lthy ✱,
Thank you for reaching out to the Microsoft Q&A forum. I am happy to assist you.
Based on the error AADSTS500213, this issue occurs because you are trying to use a personal Microsoft account (Outlook.com) to sign in to the application Workday‑SSO‑Whataburger‑PD, which belongs to the wb365.onmicrosoft.com organizational tenant.
This error appears when the resource tenant’s cross‑tenant access policy blocks access. In simple terms, the organization you are trying to access has set policies in Microsoft Entra ID that do not allow personal accounts or accounts from certain external tenants to sign in. This is done to protect the organization’s data and ensure only approved users can access their Single Sign‑On applications.
As a Microsoft Q&A forum moderator, I can help explain the cause of the error, but I cannot directly modify tenant permissions, bypass access rules, or change cross‑tenant policies. This forum is a user‑to‑user and community support platform, and Microsoft engineers also cannot override the organization’s security configuration without the tenant admin’s approval. So in this situation, even Microsoft Support cannot make any changes unless the company’s IT admin grants access or updates their policy.
Please contact the IT administrator of the organization/company that owns the Workday SSO app and ask:
Whether your account is allowed to access their SSO.
If personal Outlook accounts are permitted or if you must use a work account issued by them.
Whether they can adjust the cross‑tenant access policy to allow your sign‑in.
Once the admin updates their settings or confirms which account you should use, the sign‑in issue should be resolved.
Also, your post contained personal information (PII). To protect your privacy, I have removed it from the public thread and sent it to you via private message for reference only.
I hope this information is helpful. If you need any further assistance, please feel free to reach out. I am here to help. Thank you very much for your understanding and cooperation.