I'm resposting from this thread to hopefully create more attention for this problem: https://answers.microsoft.com/en-us/outlook_com/forum/outlk_win-outtop_new-outsub_ofb/outlook-error-message-someh...
Hello,
We have the same problem. We are using Horizon 2406 with FSLogix in Instant Clone but with persistent machines. We try to migrate our users on the new Teams but after a few days of use, the users have this error “48v35”. Restarting Windows solves the problem.
By any chance does your environment have more than 1 VM. I ask because I usually see this behavior whenever users have been logged in to a host, and they don't close their sessions appropriately (i.e. the session is just disconnected or the host is turned off and then when they log in to another host then they get that error).