URI_TRY_3LD

This error indicates that you've got a link beginning with try, start, join, or other such action-oriented verbs. The entire regular expression is kind of a beast:

^https?://(?:try(?!r\.codeschool)|start|get(?!\.adobe)|save|check(?!out)|act|compare|join|learn(?!ing)|request|visit(?!or|\.vermont)|my(?!sub|turbotax|news\.apple|a\.godaddy|account|support|build|blob|images?|photos?)\w)[^.]*\.(?:(?!list-manage|lt\.)[^/.]+\.)+(?:com|net)\b,i

To avoid flagging this rule, make sure none of your URLs fall victim to this. Unfortunately, that's... very difficult in many cases, as this rule is prone to a lot of false positives. Using a link re-writer or proxy (such as Buttondown's) will help.