MIcrosoft will be moving all online services to Transport Layer Security (TLS) 1.2+ to provide best-in-class encryption, and to ensure the service is more secure by default. Once this change takes effect on October 15, 2020, all connections to Office 365 using the protocols TLS 1.0 and TLS 1.1 will no longer work. You should update or replace clients and devices that rely on TLS 1.0 and 1.1 to connect to Office 365, prior to October 15, 2020.
Learn more: https://bit.ly/3jsaPJf
Posted by Jason Bell, Chief Technologist and Strategist