Hi Utakwara Peter, I want to help you with this question.
Please double-check, if you have already created another Microsoft account with the same personal info like EmailAddress, MobilePhone, Address ... . It is not possible to create multiple Trial accounts with the same Identity.
If you have further questions, I would recommend contacting Microsoft support via the Azure portal. All billing and account questions are free.
If the problem is solved for you and all questions are answered, I would be happy if you mark the answer as accepted to close the thread.