GraphAPI – Creating a Mailbox Folder via PowerShell

Scenario: You want to create mailbox folders using GraphAPI via PowerShell

Prerequisites: You already have the following configured:
Registered App in Azure: An Azure Registered app to connect to with Application Permissions for Mail.Read, Mail.ReadWrite, Mail.ReadBasic.All, and Mail.Send. (Not all permissions listed may be necessary for the specific function below)
Bearer Authentication Token: A method for pulling back a bearer token and storing it to pass Authorization into your RestAPI package (See my previous post about get-accesstoken). The get-accesstoken authenticates against your Registered App in Azure.


#1. Build $MBX
$mbx = ""

#2. Build your AppURI
$appuri = "$mbx/mailfolders"

#3. Build your $params to include the new Folder Name and if it should be hidden
                $params = @{
        	         DisplayName = "TestGraphAPI"
	                 IsHidden = $false
                     } | ConvertTo-Json

#4. Build your RestSplat package
#Build your URI Package to POST
                $RestSplat = @{ 
                    URI         = $appuri
                    Headers     = $(get-accesstoken)
                    Method      = 'POST' 
                    ContentType = "application/json" 
                    Body = $params 

#5. Execute the RestSplat package
Invoke-RestMethod @RestSplat                       

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