Hi Carlos Pino
Go to Azure Portal -> Navigate to Subscriptions -> Select your subscription -> Click on Access control (IAM) -> Under the Role assignments tab, verify that your user account is listed as an Owner or Contributor.
Assign Desktop Virtualization Contributor Role as this role is tailored for AVD and allows full management of AVD resources (except user/group assignments). You can assign it at the subscription or resource group level - https://learn.microsoft.com/en-us/azure/virtual-desktop/rbac
If the Azure Portal continues to give you issues, you can try using Azure CLI or PowerShell to create the Azure Virtual Desktop resources.
az ad sp create-for-rbac --name <your-service-principal-name> --role Contributor --scopes /subscriptions/<your-subscription-id>
Hope this helps!
Please Let me know if you have any queries.