Custom Update AD Object Invalid JSON primitive

[Cheri M]

Hello,
I have a workflow calling a custom activity (copied Update AD Object) to update user phone numbers.
When I use the test inputs and paste in my JSON it works perfectly.  Coming from the workflow input I get errors and I've tried many things.
I was able to get it to work with one variable but when I try to update multiple phone number fields in AD it doesn't work, I tried using .replace to no avail.
My workflow script builds the JSON based on the catalog item variables.  Then I create the scratchpad:

var objectDataJSON = JSON.stringify(objectData);
workflow.scratchpad.objectData = objectDataJSON;

gs.info("Update AD Phone - objectData: " + workflow.scratchpad.objectData);

The result in my test is Update AD Phone - objectData: {"homePhone":"51355","ipPhone":"551542"}

Initially I was using $inputData = ConvertFrom-Json -InputObject $ObjectData which was giving the invalid JSON error. I started using $inputData = $ObjectData | ConvertFrom-StringData which works if I am only updating one variable.
Now in the custom powershell script:

$inputData = $ObjectData
$jsonObject = ConvertFrom-Json -InputObject $inputData

Result:  2023-11-27 11:20:08 Env vars: $env:SNC_credType:AD $env:SNC_domainController:btusa.boystown.org $env:SNC_objectData:homePhone=51355`nipPhone=551542$env:SNC_objectName:che256 $env:SNC_type:User

Invalid JSON primitive: homePhone.
HRESULT: [-2147024809]

I tried using .replace in the string but it didn't change my powershell log results.

Please help!

Thank you.