To use Bitpanda with Outbank you have to set the permissions for '"Trading", "Transaktion" and "Guthaben" for your API-Key in the Bitpanda-Portal. Otherwise you won't see all accounts & transactions in Outbank.
Therefor please proceed as described here: https://support.bitpanda.com/hc/de/articles/360000727459
Then please update the configuration in Outbank as follows:
Settings > select your Bitpanda credentials > update configuration