Hey all - Autodesk quietly announced this and you may have seen the popup in Forma in the last day, or maybe not.
As of November 17, 2026 you MUST be in a currently-supported Revit version (Current - 5, So 2027, 6, 5, 4, 3, 2022) to continue to use Cloud Collaboration with that project.
This will change with each new release, so don't just upgrade to 2022, go to at least 2023 because come March/ April 2022 support will drop w hen 2028 releases.
I have come across many projects and clients that are keeping things as far back as 2019, so I know this is an industry issue. Autodesk is looking to enforce the EULA as well as not run into the headaches of people yelling when content catalog it