Garmin 67i "turn by turn" doesn't work

I'll be traveling in the USA next month. For this trip, I have purchased the following maps:
- City Navigator North America NT and
- TopoActive North America

However, I'm having serious navigation problems with my Garmin 67i. I have purchased the City Navigator® Europe NTU maps. Although the routing is selected on automotive, the device gives me erratic indications.

- For example, it makes me take detours along roads that are forbidden to traffic, when the correct route is straight ahead on the main road
- turn by turn doesn't work. In the roundabout, the trajectory tells me that I should continue straight ahead, but the turn by turn indication tells me that I should turn left with an arrow as if it were a crossroads and not a roundabout.
- After passing the roundabout, the turn-by-turn sign remains stuck on the previous erroneous sign.

Because of this lack of reliability, I decided to buy another Garmin device more suited to road navigation. I bought a Garmin DRIVESMARTTm 76 thinking it would give me peace of mind for my future trip to the USA. Unfortunately, I realize that the City Navigator North America NT and TopoActive North America maps I just bought are not transferable to my new GPS.  I now find myself with USA maps on a GPS whose navigation does not work and a new GPS that works but without the USA maps I just purchased.

I have spent a significant amount of money only to end up having to use free apps on my mobile phone for my trip to the USA. I hope that Garmin can provide a solution so that I can have a professional and reliable navigation system for this trip.

Kind Regards,

nick