With the native Office 365 solution you need to follow lengthy procedures to create Email signature . The third party tool like Sigsync provides a simple steps to add your Office 365 Email signature.

Sign in to Sigsync using your Office 365 Global admin account
Now add SPF record
Configure Exchange (online) connectors
Automatically load and manage users over centralized dashboard
Now you can create a professional Office 365 email Signature with the numerous colorful Email signature templates for every mail you send.