Hi Sundar rajan,
Thank you for reaching out to us on Microsoft Q&A forum.
It is imperative to have access to the Dynamics 365 free trial for practicing sessions. To acquire access to the free trial, please adhere to the provided instructions and provide the necessary details accordingly.
You're welcome to practice session using the Dynamics 365 free trial, but you'll need an organizational account to gain access.
https://www.microsoft.com/en-gb/dynamics-365/products/business-central
It's important to note that attempting to access the free trial with a personal account will not be successful.
If you are still facing any issue, please let us know in the comments. We are glad to help you.
If the information is helpful, please Accept Answer so that it would be helpful to community members.
Thank you.