Biometric enrollment procces

Hi,

Does anyone know how could be affect on my BC application if Im not able to enrol my biometrics within 15working days after that notification has arrived?
I try to explain my situation.
I have sent my BC application on 21st of Nov via NCS and I hopefully will get a letter about enrolling my biometrics. Unfortunately, unexpectedly I have to travel outside of the UK immediately. My friend will check everyday my post so he could notice me if I get a letter from Home Office. If they invite me to enrol my biometrics and I send them a letter about my valid reason for being away, will they accept that and could i still hope that they wont refuse my application?

Has anyone been in this kind of situation?

If you don't attend when you get the first letter giving you 15 days, you will likely get a second letter giving you only 10 days and if you still do not enroll your biometrics, your application will be refused.