The TLS version support change we posted previously (https://connect.act-on.com/hc/en-us/community/posts/360052384453-Ending-support-for-TLS-1-0-1-1-access-to-Act-On-public-REST-APIs-on-February-23-2021) has been changed from January 21, 2021 to February 23, 2021. 

This will affect any customers who have custom applications that communicate with the Act-On REST API. See the original post for details (https://connect.act-on.com/hc/en-us/community/posts/360052384453-Ending-support-for-TLS-1-0-1-1-access-to-Act-On-public-REST-APIs-on-February-23-2021)