"Patch" API to update Custom Field Dropdown

I’m pretty stumped here as I am running an API to update a series of Custom Fields within Contacts. Some of the Contacts it runs as expected. Others I am getting a response of:

{
“message”: “General error”
}

And I honestly don’t know why. My payload looks as such:

https://api.infusionsoft.com/crm/rest/v1/contacts/{contact#]

{

“custom_fields”: [
{
“content”:“Yes”,
“id”: 344
}
]
}

Not sure as to why this is working on some contacts but not others as the same custom fields live within all contacts.

Nevermind v1 vs v2 appears to be the answer.