If you go to Profile > Two-factor authentication on your device and it says that it is not your linked device, there may be various reasons for this. Changing your device or deleting the app when two-factor authentication (2FA) is activated can cause the link to a previously linked device to be lost.
If you have your backup code for deactivating 2FA, you can enter it by clicking on the Deactivate button, followed by 'No access to linked device', and then link your device again.
If you do not have your backup code, please contact our Client Service Team. You can reach us using the 'Support' function in the app or via our contact form.