Hi Ilya Bukshteyn ,
Glad to see that our issue reached your level of product management within MS : it's really reassuring regarding MS involvement.
I did not mention the SfB version in my first message as the tests we did with a vanilla Slice, literally out of the box (no SEP, SCCM agent, monitoring agent or else), connected to SfBO, on guest wifi, yielded the same results (skype client crashes when using mute/unmute or hdmi ingest). It seems like the instability could be caused by an incompatibility between HP drivers, os and/or app, but it was not identified.
I am still interested in others' feedbacks with the HP Slice if any.
You are right to point that on top of that, we have strong security constraints which entail to add some extra stuff on the MTR. Unfortunately this is not something we can contravene. Do most large firms you know grant direct internet access to their MTR ?