I had planned to do my own write up on the subject of whether links should generally be underlined within body copy, both for accessibility and usability, when I found this excellent write-up from Adrian Roselli who provides a comprehensive outline of research and recommendations in six sections:
I think links should be underlined in most contexts because it’s a clear visual indicator of what is a link, and it’s the default browser behavior. Please give this one a read and let me know if you agree!