I got the nissan connect app, I have a 2016 plate 1.6 tekna, but I have found the app a waste of time to use.
You might get more replies if you join the facebook group of which i am not part of.
Never bothered with facebook myself.

What is a BCM

Hello

I have 1.6 2016 reg
Not had issues with timing chain, think some 1.2 engines had timing chain issues early on.
There are some posts on this site mention timing chain but fingers crossed the chain should last the lifetime of the car.

Hello, it could be a duff battery.
There has been a bad batch of batteries which Nissan replaced free of charge

what engine and year

for a 4 year old car, i would push for a new replacement free.
even though car out of warranty, you can argue equipment not fit for purpose after only 4 years.

possibly heat shield near exhaust, if there are any.

Wonder if the 1.6 L petrol is affected.

this forum is for the nissan pulsar C13 model, only started production in 2014.

the noise gets more noticeable when going around a bend, that's usually a good sign bearing is on way out.
get the garage to road test the car, that should convince them there is a bearing issue