HBCI is only made available by Targobank for customers who use the mTAN(smsTAN) procedure. 

Here are further hints from Targobank, Targobank is working on solutions:

- When displaying credit card transactions (HKKAZ), the sign of the transaction amounts may be reversed.

In some cases, for example, the login does not work for some solo credit cards for private customers.
The turnover history for current and call money accounts can only be called up in the long term via the camt format (HKCAZ).