Hi Louis Roux,
The error indicates that your user account doesn't have the required license to create environments, including a sandbox environment. To resolve this, you have a few options:
1.Check License Requirements: Ensure that you have a Power Apps or Power Platform license that permits environment creation. Sandbox environment creation typically requires a paid plan like Power Apps Per User or Per App Plan, or a Dynamics 365 license.
2.Request License from Admin: If you don't have the necessary license, you may need to reach out to your system administrator or IT team to either assign you a license that includes environment creation or upgrade your existing license.
3.Use a Developer Environment: If you're just exploring or developing, you can sign up for the Power Apps Developer Plan. This will give you access to a free developer environment, which includes Microsoft Dataverse.
4.Admin-Managed Creation: If your organization restricts environment creation to administrators, you may need to ask your admin to create the sandbox environment for you.
Please feel free to contact us if you have any additional questions.
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Thank you.