Connect-MgGraph requires SecureString for accesstoken in MI auth

[mlhickey]

Simplest path may be to add:
`
$accessToken = ConvertTo-SecureString -String $accessToken -AsPlainText -Force

around line 85 prior to the actual connect attempt. Looks like this got missed during the other SecureString updates

[andikrueger]

Thanks for reporting. I’ll look into creating a fix.