I added a VM with a similar list of artifacts and it deployed successfully so I suspect the issue is with the custom artifact. I've messaged you directly to look at the custom artifact which should help us troubleshoot this further.
In general, the Azure DevTest Labs artifact troubleshooting documentation covers most of the common scenarios as well as how to troubleshoot them:
- https://learn.microsoft.com/en-us/azure/devtest-labs/devtest-lab-troubleshoot-apply-artifacts
- https://learn.microsoft.com/en-us/azure/devtest-labs/devtest-lab-troubleshoot-artifact-failure