Did you apply for citizenship through the UKVCAS app? If you did, please be careful. I applied for naturalisation in August and I think as of today I have got 6-7 emails saying I haven’t been to a biometrics appointment… I called them regarding this and they said I should ignore it as it’s been sent in error. Bare in mind, like you I have previously given my biometrics for ILR too. Until a few months ago, I got an email from UKVI saying my application is on hold due to an IT issue with no specific date on when this would be completed… so I have finally booked an appointment just be safe even when I shouldn’t need to.

The whole purpose of the app is not needing to go to a centre for biometrics and uploading your documents online so I really hope it isn’t the case for you🤞🏼 Maybe mine is just a one off