Ask an Immigration Solicitor. Get an Answer ASAP.
Good evening, as you have now received an invitation to book biometrics you should book an appointment your application will not be refused this is because the home office are aware of the delays of biometric appointments.
Then I advised contacting the home office I will send you a link how to contact them.
Due to covid it wouldn’t be refused if there was delay on biometrics by home office but the home office have resumed services therefore you should have received an appointment by now. Please contact home office ASAP.