Forum Discussion

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
Michael Mardahl's avatar
Michael Mardahl
Brass Contributor
Oct 20, 2020

Robert K 

You need to make sure you donøt have any wildcard DNS records, as the Teams upgrade experience will try and do a DNS lookup for the SfB on-prem Autodiscover records.

If you can't remove the wildcard A or CNAME records, you will need to enter the Office 365 admin center and enable Skype For business services for your domain,s and get the DNS records for Skype for Business Online setup in DNS so the Teams upgrade experience can then determine that you are not using Skype for Business on-prem.

If you ask me, they should add a -Force switch to the PowerShell command 😉

Martin_Schellin's avatar
Martin_Schellin
Copper Contributor
Dec 07, 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 16, 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.