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Island users can't communicate with externals using Skype client
I have a customer who is on S4B on prem (all users homed on prem) and some users also have the Teams client (https://docs.microsoft.com/en-us/SkypeForBusiness/hybrid/plan-hybrid-connectivity#implicat...
answering my own question, the problem is that Hybrid Connectivity was not configured and the 2 env (S4B on prem and Teams) are disconnected - Hybrid Connectivity works based on the https://docs.microsoft.com/en-us/SkypeForBusiness/hybrid/configure-hybrid-connectivity#dns-implications-for-on-premises-organizations-that-become-hybrid
answering my own question, the problem is that Hybrid Connectivity was not configured and the 2 env (S4B on prem and Teams) are disconnected - Hybrid Connectivity works based on the https://docs.microsoft.com/en-us/SkypeForBusiness/hybrid/configure-hybrid-connectivity#dns-implications-for-on-premises-organizations-that-become-hybrid