Lior Ben Porat , Apologies you are still experiencing this issue.
Based on my understanding of scenario description, just to highlight, credit-based subscriptions, such as those provided with Visual Studio, often have restrictions that prevent the purchase of certain services, including App Service Domains
Buy an App Service domain and configure an app with it
Some subscriptions types would be required to have sufficient history on Azure prior to creating an App Service Domain. Free trial and credit based subscriptions are not eligible to create an App Service Domain.
As outlined in this Azure doc:
If you no longer need a Visual Studio subscription or credit but you want to continue using your Azure resources, remove your spending limit to convert your Azure subscription to pay-as-you-go pricing.
For removing spending limit/ or your credit card from the Portal - that is Azure subscription or billing related questions, you may file a (free) support ticket with our Azure subscription support team create an Azure support request. Select Subscription Management for the issue type.
· Checkout this FAQ: How do I submit a support request if I can't sign in to the Azure portal?
· Call the customer service number for your country/region.
If the answer helped (pointed you in the right direction) > please click Accept Answer Or please share the requested/more info to help you better.