Set-AzureADUserExtension -ObjectId test@test.com -ExtensionName extensionattribute1 -ExtensionValue "stuff"
 Set-AzureADUserExtension -ObjectId test@test.com -ExtensionName extensionattribute2 -ExtensionValue "things"
 Set-AzureADUserExtension -ObjectId test@test.com -ExtensionName extensionattribute3 -ExtensionValue "stuff"
 Set-AzureADUserExtension -ObjectId test@test.com -ExtensionName extensionattribute4 -ExtensionValue "things"
 Set-AzureADUserExtension -ObjectId test@test.com -ExtensionName extensionattribute5 -ExtensionValue "test"
 Set-AzureADUserExtension -ObjectId test@test.com -ExtensionName extensionattribute6 -ExtensionValue "test"
 Set-AzureADUserExtension -ObjectId test@test.com -ExtensionName extensionattribute7 -ExtensionValue "test"
 Set-AzureADUserExtension -ObjectId test@test.com -ExtensionName extensionattribute8 -ExtensionValue "florida"
 Set-AzureADUserExtension -ObjectId test@test.com -ExtensionName extensionattribute9 -ExtensionValue "12444"
 Set-AzureADUserExtension -ObjectId test@test.com -ExtensionName extensionattribute10 -ExtensionValue "stuff"
 Set-AzureADUserExtension -ObjectId test@test.com -ExtensionName extensionattribute11 -ExtensionValue "things"
 Set-AzureADUserExtension -ObjectId test@test.com -ExtensionName extensionattribute12 -ExtensionValue "test"
 Set-AzureADUserExtension -ObjectId test@test.com -ExtensionName extensionattribute13 -ExtensionValue "test"
 Set-AzureADUserExtension -ObjectId test@test.com -ExtensionName extensionattribute14 -ExtensionValue "test"
 Set-AzureADUserExtension -ObjectId test@test.com -ExtensionName extensionattribute15 -ExtensionValue "test"

$users = import-csv "C:tempwomp.csv"

$users | ForEach-Object{

Set-AzureADUserExtension -ObjectId $_.extensionattribute1 (Get-AzureADUser -ObjectID $_.UserPrincipalName).objectID
Set-AzureADUserExtension -ObjectId $_.extensionattribute2 (Get-AzureADUser -ObjectID $_.UserPrincipalName).objectID
Set-AzureADUserExtension -ObjectId $_.extensionattribute3 (Get-AzureADUser -ObjectID $_.UserPrincipalName).objectID
Set-AzureADUserExtension -ObjectId $_.extensionattribute4 (Get-AzureADUser -ObjectID $_.UserPrincipalName).objectID
Set-AzureADUserExtension -ObjectId $_.extensionattribute5 (Get-AzureADUser -ObjectID $_.UserPrincipalName).objectID

}

Set-AzureADUserExtension : A positional parameter cannot be found that accepts argument

Get-AzureADUser : Error occurred while executing GetUser Code: Request_ResourceNotFound