Notice yesterday the message "SSL/TLS Handshake Failed". Tried a couple of reboots and that didn't solve it.
Any thoughts on the cause?
In my own trial and error...
I have now disabled device updates on the Skype for Business Online Management Shell / Configuration File on the handset to allow phones to run on a different version. Then installed S/W 18.104.22.16873. Phones now seem fine.
So my presumption is...
Microsoft done an update on the O365 servers that now require a different TLS version.
But Microsoft have forgotten that Polycom S/W 22.214.171.12425 doesn't support it.
And Microsoft haven't pushed out device updates first