Hi @eg1995
Thank you for reaching out to Microsoft Q and A Platform .
The suggested way is it to move all the resources manually, one resource group at a time using :https://video2.skills-academy.com/en-us/azure/azure-resource-manager/management/move-resource-group-and-subscription
Please review the checklist before move , Like RBAC's etc : https://video2.skills-academy.com/en-us/azure/azure-resource-manager/management/move-resource-group-and-subscription#checklist-before-moving-resources
Generally this move operation should be smooth without any failures .
Please do accept the answer if your question is answered .
Thanks & Regards,
Pradeep