Hello, @Nevil Manishkumar Patel !
This is currently a known issue which we are tracking in the following thread:
https://learn.microsoft.com/en-us/answers/questions/732559/subscription-drop-down-bar-not-loading-when-creati.html
I will continue to update that thread as I learn more. Thank you very much for including your troubleshooting steps (testing VM creation along with other resources)-- that has been very helpful in understanding the scope of the error. Thank you for being patient!