Phone home
Missing or expired licences are not uncommonly caused by failures in the network, or failures in the licence server.
Last year I was one of an entire office of developers who were temporarily deprived of IntelliJ. It turned out that the licence server, being an undemanding and generally unregarded piece of software, had been hosted on a machine whose primary purpose was something totally unconnected. When the unconnected purpose was migrated to a new machine, the licence server was decommissioned along with the old machine.