This request requires Strong Customer Authentication (SCA). Please add a key pair to your account and Stigg credentials. See https://api-docs.transferwise.com/#strong-customer-authentication-personal-tokenTo use endpoints requiring SCA, generate an RSA key pair and add the relevant key information to both Wise and Stigg:
public.pem
to your Wise user menu > Settings > API tokens > Manage public keys.
private.pem
in Stigg to the Private Key (Optional).