EBU Single Rulebook Q&A 6 November 2018 2018_4359 Does SCA apply to electronically processed SEPA Direct Debits ?

When processing SEPA Direct Debits electronically (assuming that the Direct Debit mandate has been signed digitally), does SCA apply to transactions? If not, what is the legal basis for this exemption? Today, SDD does not suffer from SCA, once the mandate is signed by the clients, future transactions will go through seamlessly.