No, it is not possible to cancel paid tickets or request a refund.
As stated in our general terms and conditions, there is no right of withdrawal and as a consumer you do not have the right to renounce the purchase.
If you are confronted with a personal setback just before the event such as: illness, an accident, a positive Corona test, quarantine, etc... even then a refund is not possible. These unforeseen circumstances are covered by the optional cancellation insurance that you can purchase when booking your tickets. You can find more information here.
Did you purchase the cancellation insurance when you bought your tickets? Please contact the insurer Allianz for more information.
Also take a look at these articles:
What measures apply to indoor events?
What is meant by the Covid Safe Ticket Plus and what does it mean for my visit?