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I understand that you are trying to create a new tenant in your Azure subscription, and you noticed that you are not able to choose the Tenant type because the option is greyed out.
Based on your issue I understand that you are using the trail subscription. Only paid customers can create a new Workforce tenant in Microsoft Entra ID. Customers using a free tenant, or a trial subscription won't be able to create additional tenants from the Microsoft Entra admin center.
- You must have the paid Microsoft Entra P1/P2 license plan to create. Customers on trial subscriptions won't be able to create additional tenants from the Microsoft Entra admin center.
If you have the paid license and still unable to create tenant, check the user settings page to ensure that tenant creation isn't turn off.
If the option is not enabled, you must be assigned at least the Tenant Creator role.
- When you create a new tenant, by default the UPN suffix comes with the .onmicrosoft.com if you want to add your own UPN suffix you need to Add your custom domain name to your tenant.
- Creating a new Microsoft workforce tenant will automatically require Multi-Factor Authentication
Hope this helps. Do let us know if you any further queries by responding in the comments section.
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