Autodesk will be updating their older cloud-based services to utilize some newer security features now offered. Those services will be updated on August 3rd, 2019. For reference, we have included the letter that Autodesk has sent out to users that still have access to the older cloud-based services. If you are using versions of 2018 Autodesk software or earlier you will likely not have access to the cloud data after August 3rd if you do not upgrade your software. The link included with the email will direct you to the web page the describes the issue and has links to updates for Autodesk software and the relevant versions.
IMPORTANT: this update applies to SINGLE USER SUBSCRIBERS. Users with perpetual or multi-user network license are not affected
If you have received this letter, it is a legitimate letter from Autodesk and is required if you intend to continue access your projects with older software.