Export CSV file of all assigned MS Teams phone numbers

ListMSTeamsNumbers.ps1

# Connect to Microsoft Teams PowerShell module
Import-Module MicrosoftTeams

# Connect to Microsoft Teams
Connect-MicrosoftTeams

# Get a list of all the users who currently have Teams phone numbers assigned
$phoneNumber = Get-csonlineuser | where-object { $_.LineURI -notlike $null } | select UserPrincipalName, LineURI

# Create a CSV file with these phone numbers
$csvPath = "/Users/test/FileNameHere.csv"
$phoneNumber | Export-Csv -Path $csvPath -NoTypeInformation

# Read the CSV file
$csvData = Import-csv -path $csvPath

# Update the column names in the first row

try {
    # Read the CSV file as a string
    $csvContent = Get-Content -Path $csvPath -Raw

    # Replace the words "UserPrincipalName" and "LineURI" with "userPrincipalName" and "telephoneNumber"
    $updatedContent = $csvContent -replace "UserPrincipalName", "userPrincipalName" -replace "LineURI", "telephoneNumber"

    # Overwrite the original CSV file with the updated content
    $updatedContent | Set-Content -Path $csvPath
}
catch {
    Write-Host "An error occurred: $_"
}

# Save the updated CSV file
$csvData = Export-Csv -path "/Users/test/FileNameHere.csv" -NoTypeInformation -Force