I have tried to connect the Sigma Rox 4.0 with an external sensor (Duotrap s). It works at first glance via Bluetooth or Ant +, but it does not work while riding. The sensor keeps trying to connect, but disconnects again 10 seconds later.

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I only gave the Sigma Rox as a gift from my wish list, so unfortunately I can't help

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As I am not familiar with the Duotrap sensor, I can only make an assumption:
The problem is probably not with the basic ability of both devices to interact but with the positioning: distance, orientation, etc. 
Also, are the batteries fully charged?

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Unfortunately, I can't help you with that. Please contact Sigma support.
https://sigmasport.com/de/service-center/

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Question about Sigma Sport Rox 4.0 GPS

I have tried to connect the Sigma Rox 4.0 with an external sensor (Duotrap s). It works at first glance via Bluetooth or Ant +, but it does not work while riding. The sensor keeps trying to connect, but disconnects again 10 seconds later.