My walks doesn't register for May Challenge

I only have walk or trail.... and neither register 

Vandring is Hiking. As I wrote, you have to change the type of that activity to Walking in Garmin Connect. I do not see any Walks in your calendar, only Hikes. Only Walk activities count towards Walking Challenges and Badges.

But I do Vandring ... every time I walk the dogs? Where do I change the activities?

As I told, there are no badges for Hikes, only for Walks. You can change it in Garmin Connect - open the activity, tap Edit, and then change the activity type to Walk

How Do I Edit an Activity in Garmin Connect? | Garmin Customer Support

Wauw! Thank you, a bit of work before me - but thank you ️

hurray! It worked !! Thank you SO much!