Comment by lan321
Is this not a solved problem? I used to have a TAN generator for my bank as a separate device I paid like 5 euros for. If you get provided an authenticator and get forced to use it for transfers essentially even if my device is compromised it doesn't matter unless their device also gets compromised. They are then free to lock it as much as they want.
If it’s just one of those 2FA code generators, that still won’t help if your phone has malware on it. The malware can just modify the transfer as you are making it and have typed in the code.
Users would also lose them far more than they lose their phones.