Hi Mitch,
Thanks for reaching out to us on the Microsoft Q&A forum.
Based on the issue description, we understand you are using a trial subscription. Free trial subscriptions cannot create an additional tenant ID. To create one, you must have a paid Microsoft Entra P1/P2 license plan. Microsoft now restricts this functionality to paid customers only, meaning trial subscription users will be unable to create additional tenants from the Microsoft Entra admin center.
Please refer to the document for your reference: What's new in Microsoft Entra ID?
Please don't hesitate to reach out to us with any other queries and include screenshots of the error.
If you found the information helpful, we would greatly appreciate it if you could acknowledge it by selecting the Accept Answer & Upvote options.