I created database xxx in Mysql Azure in the south of the UK, but the database name I created was #mysql50#.xxx.
eg: CREATE DATABASE `xxx
show databases;
#mysql50#.xxx
mysql version:5.7
General purpose, 4 vCore, 256 GB

I can drop using the following statement, but create database is just the beginning of #mysql50#
USE xxx;
DROP DATABASE xxx;
I found my database name does not contain-is normal. Once added-the #mysql50# prefix is automatically added