Skype add-in gets disabled every time logging to teams

Hi Hossam_RIAD 

In both the cases either of the Add-In can be enabled on the Outlook Client. Either Teams Add-In will be enabled or Skype for Business Add-In can be enabled on the Microsoft Outlook for scheduling the meeting. As soon as you run both the application Teams Add-in will be enabled.

Workaround:-

Disable the Teams Add-In Outlook and then try enabling Microsoft Skype for Business Meeting Add-in and restart the Teams Client. 

With Regards,

Satish U 

Hossam_RIAD 

I've written a small PowerShell script that adds DENY SetValue for the current user to this registry key's ACLs. After running it, Teams (running in user context) won't be able to change the value and it'll persistently remain at 3 (enabled in Outlook). Feel free to try, modify for the IMProvider key, and distribute. 

$regPath = 'Registry::HKCU\Software\Microsoft\Office\Outlook\Addins\UCAddin.LyncAddin.1'

Set-ItemProperty $regPath -Name LoadBehavior -Value 3

$acl = Get-Acl $regPath
$acl.Access | FT *

$idRef = [System.Security.Principal.NTAccount]([System.Security.Principal.WindowsIdentity]::GetCurrent().Name)
$regRights = [System.Security.AccessControl.RegistryRights]::SetValue
$inhFlags = [System.Security.AccessControl.InheritanceFlags]::None
$prFlags = [System.Security.AccessControl.PropagationFlags]::None
$acType = [System.Security.AccessControl.AccessControlType]::Deny

$rule = New-Object System.Security.AccessControl.RegistryAccessRule ($idRef, $regRights, $inhFlags, $prFlags, $acType)

$acl.AddAccessRule($rule)

$acl | Set-Acl -Path $regPath

$acl = Get-Acl $regPath
$acl.Access | FT *