Retrieve Message Center announcements and post to MS Teams channel

# Connect to SharePoint Online
Connect-PnPOnline -Url https://yourTenantName.sharepoint.com/ -Interactive 

# Get Message Center announcements
$announcements = Get-PnPMessageCenterAnnouncement | Where-Object { $_.Category -eq "PlanForChange" } | Select-Object Title, Description

# Connect to teams
Connect-MicrosoftTeams 

# Loop through the announcements and post to Teams channel
foreach ($announcement in $announcements) {
    $message = "$($announcement.Title): $($announcement.Description)"
    Submit-PnPTeamsChannelMessage -Team "TeamID" -Channel "General" -Message $message
}

# Example: .\Send-MessageCenterAnnouncementsToMSTeams.ps1 -Category "planForChange" -TeamName "Team Name" -ChannelName "Channel Name"

[CmdletBinding()]
param (
    [Parameter(Mandatory = $false, HelpMessage = "Specify category of the message center announcement")]
    [string]$Category = "planForChange",
    [Parameter(Mandatory = $true, HelpMessage = "Specify the display name of the team to which the channel belongs to")]
    [string]$TeamName,
    [Parameter(Mandatory = $true, HelpMessage = "Specify the display name of the channel to post the message center announcements")]
    [string]$ChannelName
)

begin {
    #Log in to Microsoft 365
    Write-Host "Connecting to Tenant" -f Yellow

    $m365Status = m365 status
    if ($m365Status -match "Logged Out") {
        m365 login
    }

    Write-Host "Connection Successful!" -f Green
}
process {
    # Get Message Center announcements
    $announcements = m365 tenant serviceannouncement message list --query "[?category == '$($Category)']" | ConvertFrom-Json
    Write-Host "Found $($announcements.Count) announcements to post to MS Teams channel"

    # Get information about Microsoft Teams team with name
    $teamInfo = m365 teams team get --name $TeamName | ConvertFrom-Json

    # Get information about Microsoft Teams team channel with name
    $channelInfo = m365 teams channel get --teamId $teamInfo.id --name $ChannelName | ConvertFrom-Json

    # Loop through the announcements and post to Teams channel
    foreach ($announcement in $announcements) {
        Write-Host "Sending message $($announcement.Title)..."

        $message = "$($announcement.Title): $($announcement.Description)"
        m365 teams message send --teamId $teamInfo.id --channelId $channelInfo.id --message $message
    }
}
end {
    m365 logout
    Write-Host "Finished" -ForegroundColor Green
}