If you have Sentinel installed, you need to update its database.
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You are also going to have a problem downloading that system into your scanner using Sentinel because Sentinel will not download or display any systems that do not have any submitted talk groups.
That system, Government of Newfoundland & Labrador (GNL) Transportation Trunking System, Provincewide, Newfoundland and Labrador does not have any submitted talk groups.
You can program the system manually through Sentinel and set the scanner to id search and if there is activity on it, you will hear it.
Or, because @ProScan software is the best and does not have these silly restrictions like Sentinel, take this hpe file I downloaded in Proscan and import it into your Sentinel. Its set for id search.
That system is also a Passport system, so it won’t show up in Sentinel. And no scanner will trunk track it either.