Skype for business on Ios Cannot Connect to Server
Let me know if this answers your question, there are a couple of other issues it might be (e.g., You can't connect to Skype for Business Online, or certain features don't work, because an on-premis Server. Sometimes, we can’t connect to Skype as we are using a different server due to which there are some complications. Thus, the proxy settings on the device should be checked from time to time, as there might be a need to manually connect to Skype and log in again as the server was facing problems.
Unable to connect to Skype If you are experiencing issues connecting to Skype, go to the Skype Status page to check for any current issues. You can also try the following steps for
Troubleshooting | Skype Support
Can't Log Into Skype for Business? Fix Connection Problems
Sep 20, 2016 · The Lync/Skype for Business clients don't use Service Connection Point (SCP) to determine the autodiscover URL. Instead, they rely on DNS records. They base this action on the user’s domain suffix of the WindowsEmailAddress or Mail attribute in Active Directory.