How do I create a roster plan?

JohnMoore33 Thanks for the info this was very helpful! I used your info to convert this into a set of PowerShell commands for anyone to try:

#Import Modules if needed
Import-Module Microsoft.Graph.Beta.Planner

#Connect to Graph with your credentials
Connect-MgGraph -Scopes "Tasks.ReadWrite"

#Capture Name of Planner
$Title = Read-Host -Prompt 'What is the Roster Plan name?'

$params = @{
	"@odata.type" = "#microsoft.graph.plannerRoster"
}

#Save to variable to capture containerID for later
$ContainerID = New-MgBetaPlannerRoster -BodyParameter $params

$params = @{
	container = @{
		"@odata.type" = "microsoft.graph.plannerPlanContainer"
		#Use saved ContainerID
		"containerId" = $ContainerID.Id
		"type" = "roster"
        }
	title = $Title
}

New-MgBetaPlannerPlan -BodyParameter $params