Currently this is not available in Teams admin center.
Please use Teams powershell instead.
Reference: Manage caller ID policies in Microsoft Teams
To set the caller ID to a resource account phone number and to set the calling party name, use the PowerShell cmdlets New-CsCallingLineIdentity or Set-CsCallingLineIdentity in the Teams PowerShell module 2.3.1 or later. (These options are not currently available in the Microsoft Teams admin center.)
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