Please note that the following answer only applies to clients residing in Germany.
To make use of your tax allowance in your Scalable account, you need to set up a new tax exemption. You can do this in the app in the Profile under Account details (Scalable Capital) > Set up tax exemption or on the web under Profile > Taxes.
The maximum tax exemption in 2025 is €1,000 for single persons and €2,000 for married couples and registered partnerships. Hence you can choose to split up the tax exemption between Scalable and Baader.