We just bought a t32 2017 plate xtrail and had the same issue. I contacted Nissan as the VIN wasn’t recognised. This was their reply.
“Thank you for contacting Nissan Customer Services regarding your Nissan X-TRAIL.
We understand that you are trying to enter your VIN to the NissanConnect Services application and are receiving an error message stating that your VIN is not recognised.
Your vehicle is a Nissan X-TRAIL from 2017 - This means that your vehicle is not compatible with the NissanConnect Services app, which is why you are receiving an error message.
We would like to sincerely apologise as, currently, there are no Nissan apps offering connected services that are compatible with your vehicle.
Despite there being no connected services apps compatible with your vehicle, your Bluetooth, sat-nav and radio should still be functional. Should you require any assistance setting up or using these features in your vehicle, please let us know and we will be more than happy to help.
If you would still like to use an app with your vehicle, we can advise you of the “NissanDriver’s Guide” app, which uses augmented reality to explain features in your vehicle. This app, however, does not provide any connected services between your vehicle and phone.”
I replied and asked them why the manual states there is an app. This was their reply.
“Thank you for contacting Nissan Customer Services.
Your vehicle was equipped with an app which was discontinued named "NissanConnect" this app did not have the same features as NissanConnect Services and there has never been an ability to pull journey history via any app, for any X-trail
Unfortunately, due to the low usage rates of the app, Nissan made the decision to discontinue the NissanConnect app on 31st March 2020.
We would also like to advise you that despite there being no connected services apps compatible with your vehicle, your Bluetooth, sat-nav and radio should still be functional. Should you require any assistance setting up or using these features in your vehicle, please let us know and we will be more than happy to help.
If you would still like to use an app with your vehicle, we can advise you of the “NissanDriver’s Guide” app, which uses augmented reality to explain features in your vehicle. This app however, does not provide any connected services between your vehicle and phone.”
All in all, very disappointing, we have a Citroen C4 grand Picasso 2014 plate as well and even they have an app and actually quite a decent one at that. Not impressed with Nissan just turning the app off for this vehicle.