Hello @Bart_VdB -
Since we aren't able to create a flow trigger off a new SharePoint list comment, I created a Teams notification that is triggered off the email that is sent automatically when a comment is added to SharePoint list.

The messages from Microsoft use a standard template for the Subject when a new comment is added to a SharePoint list item, so I used that to create a Subject Filter. Replace the LIST NAME with your unique List Name.

Initialize a string variable and then set it to the body of the email message:

Use the next two Compose functions to 1) trim all the beginner information away from the start of the URL and 2) then split the remaining string into multiple strings and only return the first item of the resulting strings.

COMPOSE TrimStart:
substring(variables('Text'),IndexOf(variables('Text'),'https://YOURDOMAIN.sharepoint.com/sites/SITENAME/Lists/LISTNAME'))
COMPOSE Split TrimStart:
first(split(outputs('Compose_TrimStart'),'" shash="'))
Finally, format the Teams message to include the resulting URL as a usable link in the Teams notification:

Hope this helps!
Vanessa