Here is the Microsoft troubleshooting page. It may help you. Also if your cable is over 3 feet it can be a problem.
https://support.microsoft.com/en-us/help/4023496/surface-troubleshoot-connecting-to-a-second-screen
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I'm having trouble getting my surface book 2 to output the maximum resolution on my ultrawide monitor. The monitor is 4k compatible but for some reason, I'm only able to display a max resolution of 3840 x 1080. I'm using a USB c to DisplayPort connection which is built for 5k 60fps. Any ideas on how to get the maximum resolution of 3240 x 2160 on an ultrawide display?
Computer model: Surface book 2
Graphics: UHD Graphics 620
Monitor: Samsung CRG9 49"
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Here is the Microsoft troubleshooting page. It may help you. Also if your cable is over 3 feet it can be a problem.
https://support.microsoft.com/en-us/help/4023496/surface-troubleshoot-connecting-to-a-second-screen