I little late on the reply, but I am having intermittent issues with this as well.
Horizon 2103, AppVol 2103, Instant Clones, writable UIA+Profile 75% of users work fine with Optimized Teams. The rest have one-way sharing issue (they can see but can't share or vice-versa) A few have even reported being in an active meeting and seeing the share, then it goes black after 20 minutes and never comes back.
I have an open ticket with VMware now, but no feedback yet
-Bob