Hi, PIrvine.
Thank you for contacting the Microsoft community.
As we understand from your post, you have manually deleted the Concierge Subscription resource group, and now you are unable to set up a sandbox. We are happy to help!
You have contacted us through the Microsoft Credentials support forums. Please note that we can only provide support regarding your Certification Profile, and the achievement of the Certifications listed on our platform.
To receive appropriate assistance with your request, we invite you to visit the Microsoft 365 Dev Center support page: Services Hub.
In case you are having trouble accessing the Learning materials available in Microsoft Learn, we invite you to submit a Feedback Form to the Microsoft Learn support team by visiting Microsoft Learn support - Troubleshooting known issues.
You will find this option at the bottom of the page, as shown in the image below.
.
We hope that you find this information to be helpful. If you require assistance regarding your Certification Profile, please let us know.
If your concern has been resolved, please let us know by selecting "Yes" where it says, "Did this solve your problem?" located at the lower right corner of this post. This will close the thread.
If we do not receive a response, the case will be closed and locked after one business day.
Best regards,