Hi @ED_DA_BEAST I'm sorry to hear that you are experiencing an issue where Eivor is unable to attack whilst in Vinland.
Could you please ensure you have the latest update (1.6.1) installed.
If you already have the latest update installed then could you try leaving Vinland if possible, or fast travel to another location then fast travel back and see if the issue persists. If it does then could you provide a video that demonstrates this issue. In the video could you please show the location on the map where this issue occurs if it is only in a specific location.
I would recommend uploading your video to a video sharing platform such as YouTube, you can then copy the URL link into this thread.
Can you also ensure that your latest save is uploaded to the cloud. If you are unsure how to do this there is a support article that you can check here.