Office 365 StaffHub retirement-

Effective October 1, 2019, Microsoft StaffHub will be retired. We're building StaffHub capabilities, including schedule and task management, into Microsoft Teams. To learn more, read Microsoft StaffHub to be retired.
Microsoft has announced that Office 365 StafHub will be replaced by Shift. Find more details here https://docs.microsoft.com/en-us/microsoftteams/teams-for-firstline-workers/microsoft-staffhub-to-be-retired

Allow corporate announcements to StaffHub members 

StaffHub has a feature to make this announcement to all StaffHub users. Find the details below

Send corporate announcements to all StaffHub members


But it is bit challenge to inform only StaffHub Team managers. The PowerShell module does not any commends to get list of Team Managers.

Find the script which will give all StaffHub Team managers from current tenant.

Function ConnectToStaffHub
{
    #install StaffHub module
    #InstallInstall-Module -Name MicrosoftStaffHub  

    #Capture global administrator credentials
    $cred=Get-Credential

    try{

        #connect to StaffHub
        Connect-StaffHub -Credentials $cred
        MsgLog -Msg "Connected to StaffHub successfully" -Cat "1"
    }
    Catch{
    
        MsgLog -Msg "StaffHub connection failed"  -Cat "3"
        MsgLog -Msg $_.Exception.Message -Cat "3"
    }
}

function MsgLog($Msg,$Cat)
{
    # set the new color based on category
    if($Cat -eq "1"){
        $foreColor="Green"
        $Msg= "Success : " + $Msg
    }

    if($Cat -eq "2")
    {
        $foreColor="Yellow"
         $Msg= "Warning : " + $Msg
    }
    if($Cat -eq "3"){
        $foreColor="Red"
         $Msg= "Error : " + $Msg
    }
   
    # output
    Write-Host $msg -ForegroundColor $foreColor

}

Function GetStaffHubManagers($csvPath)
{
try{
    #Get all staffhub teams for tenant
    $teamsColl=Get-StaffHubTeamsForTenant   
    $hubColl = New-Object System.Collections.ArrayList

    for($a=0; $a -lt $teamsColl.Id.Count; $a++){
        
        $members=Get-StaffHubMember -TeamId $teamsColl.Id[$a] `
        | where IsManager -EQ "True" `
        | select Email, State, DisplayName
        
        $temp = New-Object System.Object
        $temp | Add-Member -MemberType NoteProperty -Name "TeamName" -Value $teamsColl.Name[$a]
        $emails=""
        $DispNames=""

        foreach($mem in $members){
            $emails =$emails+$mem.Email+";"
            $DispNames =$DispNames+$mem.DisplayName+";"
        }        
        
        $temp | Add-Member -MemberType NoteProperty -Name "Email" -Value $emails
        $temp | Add-Member -MemberType NoteProperty -Name "DisplayName" -Value $DispNames

        $hubColl.Add($temp) | Out-Null
    }
    $hubColl | Export-Csv -Path $csvPath

    MsgLog -Msg "StaffHub information exported" -Cat "1"

    }
    catch{
        MsgLog -Msg "Error : Extract failed" -Cat "3"
        MsgLog -Msg $_.Exception.Message -Cat "3"
    }
} 

ConnectToStaffHub
GetStaffHubManagers -csvPath "C:\KMSlab\StaffHub\Export-Csv new.csv" 

Get it from GitHub https://github.com/kmsrajan/O365/tree/master/StaffHub