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Use the nslookup command and a public DNS server to determine whether the DNS CNAME record is configured correctly. To troubleshoot, use one or more of the following methods, as appropriate for your situation:
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For the Auto-Detect process to discover the correct Skype for Business Online service, a CNAME record that meets the following criteria must be created for the SIP domain that's being used: Alias The Skype for Business for Android looks for different DNS records than the Skype for Business desktop client. To access the User name, Domain, Internal discovery address, and External discovery addressfields, select Server Settings on the sign-in screen. The Sign-in address and Password fields are displayed on the sign-in screen. *These addresses are valid only for Microsoft 365 users and will be different for On-premises Skype for Business Server deployments. If automatic discovery for mobile clients hasn't been configured, users have to enter the following internal and external discovery addresses in addition to the fields that are listed in the table: Sign-in address: SIP address User name: UPN Password: Password
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Sign-in address: SIP address User Name: Blank Password: Password Sign-in address: SIP address **User name:**UPN or domain\username Password: Password **Sign-in address:**SIP address User name: Blank Password: Password The following table describes the sign-in fields required for Android users: User is hosted by
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