UBA is using a technology we call Data Mining in ICT. your Biometrics data is already with the Telecom companies you registered your SIM with so when you send that code, your biometric information will be sent to UBA behind the scene.
the point I am making is this; if the line you receive your bank transaction alerts with was not registered by you but someone else did it for you, then don't try sending that code because it'll be that persons Biometrics that shall be sent to UBA and not yours. the implication is this, if they start withdrawing with thumbprints you'll never make withdrawals from your account.