You can create new standard channels in One Identity Manager but you cannot create private channels in One Identity Manager.
To create a standard channel
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In the Manager, select the Azure Active Directory > Channels category.
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Click
in the result list.
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On the General tab, enter the following data:
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Display name: Channel name that the user sees in Microsoft Teams.
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Membership type: When standard channels are created, they have the Standard type. This channel is available to all the team's members.
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Description: Detailed description of the channel.
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Team: The channel belongs to the team selected here.
 
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Save the changes.