Hello Marco Adamo,
Thanks for your question.
This is usually a capacity issue at the moment related issue at the Availability Zone.
I will recommend you try a different availability zone and/or different varieties of the VM.
Resizing the VM/Redeploying the VM to a different zone can fix the issue for you.
I checked the status page and confirmed it is currently not a service downtime issue.
Also see: Troubleshoot allocation failures when you create or resize VMs in Azure for detailed steps.
Regards,
Abiola
You can mark it 'Accept Answer' and upvote if this helped.