Could not create table on 'master' database

Question

Hello,
     I am new to the SQL Azure. When I tried to create table on master DB, i get following error.
Msg 262, Level 14, State 1, Line 1CREATE TABLE permission denied in database 'master'.
I tried to change role to 'db_owner' but have received following error.
Msg 15151, Level 16, State 1, Line 1Cannot alter the role 'db_owner', because it does not exist or you do not have permission.
I logged into master DB using the credentials I created while creating DB on the Azure. This is supposed to be 'sa'.
My question is, does SQL Azure allow to create objects (tables, stores procedures, triggers) on master DB. If yes, what am I doing wrong? If no, why?
My guess is that SQL Azure is not less than the On premises DB. It must be allowing objects creation on master DB.
I have found a similar question on forum but I did not get the answer. Here is the link --> https://social.msdn.microsoft.com/Forums/azure/en-US/cbff1bd2-358f-4106-b238-ec369941099d/master-database-cannot-alter-the-role-dbowner.
FYI, I have gone through following resources but haven't got solution for my problem.
1) https://iainhunter.wordpress.com/2011/06/20/copying-databases-and-creating-users-and-logins-for-sql-azure/
2) http://www.c-sharpcorner.com/forums/thread/126589/create-database-permission-denied-in-database-master.aspx
3) http://stackoverflow.com/questions/20656943/how-do-you-change-the-owner-of-an-azure-database
4) https://msdn.microsoft.com/en-us/library/azure/ee336235.aspx
Thanks in advance.

Answer 1

My question is, does SQL Azure allow to create objects (tables, stores procedures, triggers) on master DB. If yes, what am I doing wrong? If no, why?
My guess is that SQL Azure is not less than the On premises DB. It must be allowing objects creation on master DB.
For the answer of the question, you can read Joseph's. Azure SQL, so far, is less than the premise DB except its
cloud-based advantage. There're many limitations like less T-SQL features supported.
Azure SQL Database Transact-SQL Reference
more links for your reference.
Preview features
Managing Databases and Logins in Azure SQL Database
Eric Zhang
TechNet Community Support