I cannot create a recurring profile in my sandbox account, which works otherwise. I am using a generated test card number (and I have tried a variety):
NVP pairs submitted are:
ZIP -> 19147
CREDITCARDTYPE -> Visa
SUBSCRIBERNAME -> Tim <removed>
PROFILESTARTDATE -> 2019-12-05T11:55:32Z
AMT -> 10.00
STATE -> PA
FIRSTNAME -> Tom
BILLINGFREQUENCY -> 1
STREET -> <removed>
PROFILEREFERENCE -> -<removed>
EMAIL -> [email address]
ACCT -> <removed>
BILLINGPERIOD -> Month
DESC -> Scheduled pledge Payment
TOTALBILLINGCYCLES -> 0
CURRENCYCODE -> USD
CVV2 -> 009
EXPDATE -> 032021
CITY -> Philadelphia
COUNTRYCODE -> US
LASTNAME -> <removed>
METHOD -> CreateRecurringPaymentsProfile
