Based on the error message posted, it looks like the deployment of Personal Host Pool is failing with DSC Extension Failure
Cause: DSC extension is failing to install because the VM is not able to download the required package: Error downloading https://wvdportalstorageblob.blob.core.windows.net/galleryartifacts/Configuration_5-5-2021.zip
Resolution: Allow VMs access to all the required URLs as per Microsoft Official Documentation. Azure Virtual Desktop required URL list - Azure | Microsoft Learn
This outlines which URLs need to be allowed through the firewall for full compliance.
After following the step above, if you see WVD deployment failing at domain-join phase.
Cause: Incorrect UPN used for deployment.
Resolution: Since the current domain admin UPN used for the WVD deployment couldn't sync with Azure AD and the UPN doesn’t match with the on AD, please provide admin privileges to one of domain users and re-try the deployment with the correct UPN.