Trying to update custom attribute fields on a ticket

Hi all,

I am trying to update a custom attribute that is on a ticket, although I cannot seem to get anything to populate there. I am able to update other fields such as the title with no issues. The way the code is right now it runs with no issues, but the attribute field never updates. This is written in powershell, I also ommitted the code to grab the jwt,, and the endpoint

$headers = @{
    'Content-Type' ='application/json'
    Authorization = "Bearer $jwt"
}

$attributeInfo = @{
    ID = 134674
    Value =' 87'
}

$Attribute = (ConvertTo-Json $attributeInfo)

$update = @{
    RequestorUid = 'ommited'
    ResponsibleUid = 'ommited'
    AccountID = 103117
    PriorityID = 6260
    StatusID = 128627
    TypeID = 39643
    FormID = 58191
    Title = 'Ticket Title Ommited'
    Attributes = $Attribute

}

$Body = (ConvertTo-Json $update)

$Params = @{
    Method = 'Post'
    Uri = $APIRequest
    Headers = $headers
    Body = $Body
}
Invoke-RestMethod @Params | ConvertTo-Json