CreateChannel in GraphAPI sometimes results in not creating the corresponding Sharepoint/OneDrive

I ran into the problem where I could create the Team with a General channel and then channels for each of our departments but the SharePoint sites for the channels where not created without manually clicking the Files tab in the Teams app.   I was able to programmatically create the channel SharePoint sites by just calling the filesFolder for the General channel prior to creating the channels for the departments.  Then when I created the channels, the sites were automatically created correctly.   Below is very simple code I wrote.   It by far isn't polished but more a proof of concept.  I hope this will help someone else.

$departments = @("BD","Clinical Operations","Data","Finance","HR","IT","Legal","QA")

$companyName = "{YOUR COMPANY URL}"

$companyEMailDomain = "yourdoamin.com"

# We use an application and certificates for authentication - out of scope for this question

Connect-MgGraph -NoWelcome -CertificateThumbprint $cert.Thumbprint -TenantId "$companyName.onmicrosoft.com" -ClientId $client_id

$owner_user = Get-MgUser -UserId 'owner@$companyEMailDomain'

$member_user = Get-MgUser -UserId "member@$companyEMailDomain"

$filter = "displayName eq '" + $teamName + "'"

$team = Get-MgTeam -Filter "$filter"

(! $team)

{

    Write-Host "Creating the new team $teamName..."

    $params = @{

    "email address removed for privacy reasons" = "https://graph.microsoft.com/v1.0/teamsTemplates('standard')"

    visibility = "Private"

    displayName = "$teamName"

    description = "$teamName Team"

    members = @(

        @{

            "@odata.type" = "#microsoft.graph.aadUserConversationMember"

            "email address removed for privacy reasons" = "https://graph.microsoft.com/v1.0/users('owner@$companyEMailDomain')"

            roles = @(

                "owner"

            )

        }

    )

    }    

    New-MgTeam -BodyParameter $params

    $team = Get-MgTeam -Filter "$filter"

    Write-Host "Completed"

    while (! $team)

    {

        Write-Host "Sleeping 10 seconds..."

        Start-Sleep -Seconds 10

        $team = Get-MgTeam -Filter "$filter"

    }

    $params = @{

        "@odata.type" = "#microsoft.graph.aadUserConversationMember"

        roles = @(

            "member"

        )

        "email address removed for privacy reasons" = "https://graph.microsoft.com/v1.0/users('member@$companyEMailDomain')"

    }

    New-MgTeamMember -TeamId $team.Id -BodyParameter $params

}

else

{

    Write-Host "The team '$teamName' already exists...skipping creation!"

}

$url = "https://$companyName.sharepoint.com/sites/" + $teamName.Replace(" ","")

$admin_url = "https://$companyName" + "-admin.sharepoint.com"

try {

    Connect-SPOService -Url "$admin_url" -ModernAuth $true -AuthenticationUrl "https://login.microsoftonline.com/{GUID}" -Verbose:$true

    Register-SPOHubSite "$url" -Principals $null

}

catch {

    Write-Host "Connect-SPOService Failed"

}

$newChannelFilter = "displayName eq 'General'"

$newChannel = Get-MgTeamChannel -TeamId $team.Id -Filter "$newChannelFilter"

$fileFolderUrl = "https://graph.microsoft.com/v1.0/teams/" + $team.Id + "/channels/" + $newChannel.Id + "/filesFolder"

Invoke-MgGraphRequest -Method GET "$fileFolderUrl"

$channels = Get-MgTeamChannel -TeamId $team.Id

foreach ( $department in $departments )

{

    $found = $false

    foreach ($channel in $channels)

    {

        if ($channel.DisplayName -eq "$department")

        {

            $found = $true

        }

    }

    $hubSiteUrl = "https://$companyName.sharepoint.com/sites/" + $teamName.Replace(" ","")

    if ($found -eq $false)

    {

        Write-Host "Creating new channel for $department..."

        $params = @{

            "@odata.type" = "#Microsoft.Graph.channel"

            membershipType = "private"

            displayName = "$department"

            description = "$department channel"

            members = @(

                @{

                    "@odata.type" = "#microsoft.graph.aadUserConversationMember"

                    "email address removed for privacy reasons" = "https://graph.microsoft.com/v1.0/users('owner@$companyEMailDomain')"

                    roles = @(

                        "owner"

                    )

                }

                @{

                    "@odata.type" = "#microsoft.graph.aadUserConversationMember"

                    "email address removed for privacy reasons" = "https://graph.microsoft.com/v1.0/users('member@$companyEMailDomain')"

                    roles = @(

                        "member"

                    )

                }

            )

        }

        $newChannel = New-MgTeamChannel -TeamId $team.Id -BodyParameter $params

        Write-Host "Completed"

    }

    else

    {

        Write-Host "The team channel $department already exists...skipping creation!"

    }

    $channelUrl = "https://$companyName.sharepoint.com/sites/" + $teamName.Replace(" ","") + "-" + $department

    $newChannelFilter = "displayName eq '$department'"

    $newChannel = Get-MgTeamChannel -TeamId $team.Id -Filter "$newChannelFilter"

    $count = 1

    try {

        $fileFolder = Get-MgTeamChannelFileFolder -TeamId $team.Id -ChannelId $newChannel.Id

    }

    catch {

    }

    while (! $fileFolder)

    {

        Write-Host "Could not find $department channel folder....sleeping 30 seconds and trying again"

        Start-Sleep -Seconds 30

        try {

            $fileFolder = Get-MgTeamChannelFileFolder -TeamId $team.Id -ChannelId $newChannel.Id

        }

        catch {

        }

        $count += 1

        if ($count -eq 11)

        {

            Write-Host "ERROR: Could not get the channel site folder...."

            break

        }

    }

    if ($fileFolder)

    {

        Write-Host "Found $department channel folder....adding hub association."

        Add-SPOHubSiteAssociation "$channelUrl" -HubSite "$hubSiteUrl"

    }

}