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Robert K's avatar
Robert K
Brass Contributor
Sep 30, 2020
Solved

Unable to switch to Teams-only mode

I tried to switch from Island mode to Teams-only mode. But the admin center is not accepting the setting. Why?      The screenshot shows one of my demo tenants. But I have the exact same iss...
microsoft teams
Martin_Schellin's avatar
Martin_Schellin
Copper Contributor
Dec 08, 2020
Hey Michael,
where can i enable Skype For business services for our domain's?
We have a primary forward lookup zone where all Skype DNS Entries setting up correctly. While we were trying to switch coexistence mode to teams only, we get an error that there is an on-premise deployment of Skype for Business detected in 1 or more of it sip domains, *DOMAIN*. Our users do have a UPN with a different domain. Do i have to create a secondary zone and add the skype DNS entries as well?
Best regards Martin
adam deltinger's avatar
adam deltinger
MVP
Dec 08, 2020
you set this on your external dns. and for the domain you are using..

Check domains in admin portal..from there you can see what records you need
  • Martin_Schellin's avatar
    Martin_Schellin
    Copper Contributor
    Dec 08, 2020

    Hey Adam,
    thanks for response. I can see, that we have one domain with missing DNS Seetings on united-domains (cname + SRV), i think once we added the required entries, we will be be able to do the Teams only Upgrade.
    Thanks and best regards

    • DexteroCeros's avatar
      DexteroCeros
      Copper Contributor
      Feb 17, 2021

      Martin_Schellin

      https://docs.microsoft.com/en-us/microsoftteams/upgrade-to-teams-on-prem-tools 
      In addition, you cannot assign TeamsOnly mode as the tenant-wide default if you have a Skype for Business on-premises deployment (which is detected by presence of a lyncdiscover DNS record that points to location other than Office 365.

      • Moritz's avatar
        Moritz
        Copper Contributor
        Mar 01, 2021

        DexteroCeros 

         

        Hello,

         

        does anyone know if the DNS check is performed against all domains that are added in the tenant? We have added a lot of domains in the tenant and use only a small fraction of the domains for Skype / Teams. The rest is used only sporadically in Exchange Online. Are these domains also queried and do we really need to set the DNS entries for all domains?

         

        Thanks in advance.

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