It is possible to e-sign with BankID, Touch, and SMS. You need to approve this to allow more signing options, which you do under the settings for your board room.
You can start by clicking on "Administration" > "Settings" in the left menu and then on the "Advanced Settings" button.
Scroll down to “Meetings” and select the signing option “Sign minutes with the same methods as other documents”.
Then scroll down to “E-Signing” and select "Allow signature method customization". Then, choose which signing options should apply. Finish by clicking “Save”.