You need to configure the user accounts of the sales department users to meet the security requirements.
What should you do for each user?
From PowerShell, run the Grant-CsTeamsUpgradePolicy -PolicyName
SfBWithTeamsCollabAndMeetings cmdlet.
From the Microsoft Teams admin center, set the Microsoft Teams upgrade policy to Islands coexistence mode.
From PowerShell, run the Grant-CsTeamsUpgradePolicy -PolicyName Islands cmdlet.
From PowerShell, run the Grant-CsTeamsUpgradePolicy -PolicyName SfBOnly cmdlet.
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