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User Unable to Login (On-Premise Skype)

Retired product. Microsoft retired Skype for Business Online on July 31, 2021, and support for Skype for Business Server 2015 and 2019 ended on October 14, 2025. Microsoft Teams replaces them. This article is kept for reference. Skype for Business Online retirement
Written June 2020. Microsoft changes these admin screens often, so the screenshots below may not match what you see today. The sequence of steps is usually still correct — if something looks wrong, tell us and we'll update it.

Time to Execute: 45m

Kindly look if the correct DNS records are setup.

Look for AV records and CName External Access Edge Pool record.

Open cmd and type av.domain.com and look if they are pointing to the edge external ip addresses. And same for CName sip,domain.com and see if the output is the address of edge pool..

Further

For mobile client if wanted, create a lyncdiscover record which will point to reverse proxy.. 

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