Hi Tony Wong,
Thank you for contacting us on Microsoft Q&A forum.
Based on question we understand that you are facing an issue while creating a VM image version in Azure Compute Gallery.
Please check that the image configuration is correct, including the image name, version, and region.
The region for the VM and the disk might not match for the selected region image version.
Please follow the below document for your reference:
If you are still facing any issue, please let us know in the comments. We are glad to help you.
Thank you.