Dell XPS 15 9500 / GTX 1650ti HW encoding FAIL

Hello,
first of all, sorry for my bad english, but this is not my motherlanguage.
Iam using DaVinci Resolve for many years now, and iam happy with it. Now i bought a new DELL XPS 15 9500 for mobile Editing with this config:
- Core i7 10750H
- 64GB RAM
- 3840x2400 UHD+ Display
- GTX 1650ti / 4GB GDDR6
- 1 TB NVMe SSD
I have a fresh installed Windows 10. All necessary Drivers are installed/up-2-date and DaVInci Resolve 17 (Studio) is up to date too. I can import/edit Videos (4K 60FPS) very good. All is smooth and fine. But at the End, when i try to export (i want to use the Nvidia HW Encoder) i get errors. (Export is set to MP4 Container, Bitrate 50MBit), No matter if h.264 or h.265:
Render Job failed as the current clip could not be processed:
Cannot find appropriate codec for encoding the video frame
I can use other tools for conversion and using NV HW encoder, so all necessary things seems to be installed, because they working like a charm.
Of course, i can use native Encoder (CPU) or Intel quicksync... but thats not the way i want to use (i bought this config because of CUDA and NV HW Encoder)
Is there a know fix for that?
first of all, sorry for my bad english, but this is not my motherlanguage.

Iam using DaVinci Resolve for many years now, and iam happy with it. Now i bought a new DELL XPS 15 9500 for mobile Editing with this config:
- Core i7 10750H
- 64GB RAM
- 3840x2400 UHD+ Display
- GTX 1650ti / 4GB GDDR6
- 1 TB NVMe SSD
I have a fresh installed Windows 10. All necessary Drivers are installed/up-2-date and DaVInci Resolve 17 (Studio) is up to date too. I can import/edit Videos (4K 60FPS) very good. All is smooth and fine. But at the End, when i try to export (i want to use the Nvidia HW Encoder) i get errors. (Export is set to MP4 Container, Bitrate 50MBit), No matter if h.264 or h.265:
Render Job failed as the current clip could not be processed:
Cannot find appropriate codec for encoding the video frame
I can use other tools for conversion and using NV HW encoder, so all necessary things seems to be installed, because they working like a charm.
Of course, i can use native Encoder (CPU) or Intel quicksync... but thats not the way i want to use (i bought this config because of CUDA and NV HW Encoder)
Is there a know fix for that?