v2/vault/payment-tokens API error "Authorization failed due to insufficient permissions."

[WaynePet]

Hi Everyone

When we call API "/v3/vault/setup-tokens, it is still giving the following error":

{
    "name": "NOT_AUTHORIZED",
    "message": "Authorization failed due to insufficient permissions.",
    "debug_id": "f608154b1aa26",
    "details": [
        {
            "issue": "NOT_ENABLED_TO_VAULT_PAYMENT_SOURCE",
            "description": "The API caller or the merchant on whose behalf the API call is initiated is not allowed to vault the given source. Please contact PayPal customer support for assistance."
        }
    ],
    "links": [
        {
            "href": "https://developer.paypal.com/docs/limited-release/payment-tokens/v3/api/#error-FORBIDDEN",
          ...

@MTS_Jennifer  merch ID and debug Id are as follows.  The changes that were made previously didn't seem to give us any joy.

Sandbox account merchant ID: ZLXXXCDNJR4RA

"debug_id": "f608154b1aa26",

Any help would be greatly appreciated.