@AshokPeddakotla-MSFT , Thanks that you have converted the query to English. I asked in Portuguese because my interface was shown in Portuguese, making me think that this was a brazilian forum.
Addicionaly, I think I solved my problem. First, I had to create my resource group in additional step, not in the same step for resource creation (that was causing the error). After that, I sucefully created the resource pointing to group created earlier.
Thanks for yout attention.