All forms of user access to TCC has been revoked. This includes TCC user interface, TCC Legacy interface, TCC Explorer, TBC Office Synchronizer, and TCC FTP/ HTTP api access. Alternate features including File Explorer - Folder Operations (Upload, Download, Move, Copy, Delete), and IBSS 3rd party sharing have been already released in Trimble WorksManager.
Note that TCC device integration with legacy devices like GCS will continue to work without any disruption.
Here is the heads up article on TCC deprecation posted earlier along with additional FAQs in the comments section. And here is the blog article of 3rd party sharing for reference.