Skype for Business couldn't find a Skype for Business server...

Issue

Skype for Business fails to sign in for Office / Microsoft 365 customer.

Skype for Business error

Can't sign in to Skype for Business
Skype for Business couldn't find a Skype for Business Server for <domain.com>. There might be an issue with the Domain Name System (DNS) configuration for your domain. See KB2566790 for details and contact your system admin.

Resolution

The issue was caused by missing Skype / Lync related DNS records for the domain in question. After adding DNS entries as displayed below users could log in to Skype for Business with no issues.

Skype for Business DNS records

August 2020
Microsoft Office 365
Skype for Business

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