Claudenilson Teles Greetings!
Currently the Free subscription no longer allows for Azure OpenAI use regardless of gating email.
Our team is working on getting this communicated to avoid any confusion and inconvenience.
Your subscription should be a pay-as-you-go account to ensure Azure OpenAI deployments are successful once your request is approved. Since you are using free trial subscription, please upgrade to pay-as-you-go and try.
Also, check Azure account requirements to get started to ensure Azure OpenAI deployments are successful once your request is approved.
Hope this helps. Do let me know if you have any further queries.