Microsoft is banning your stupidly easy-to-guess passwords
No matter how many times we tell you to change your passwords and make it anything but your birthday, “123456,” or “password,” many still aren’t taking the efforts to make their accounts more secure. So Microsoft is actively doing something about it by banning weak passwords entirely. The team calls it “dynamically banned,” which means that if your account uses a password that appears in the most-used/stolen password list, Microsoft will force you to create a more complex one instead. This will apply to Microsoft Account and Azure AD services.