Tested it in stadium practice range workshop 7x3py
When ability is used, weapon power should be boosted for 3 seconds, but the icon doesn’t show up, neither does damage get buffed. Seems like I can only get the icon to show up when ult is used either in mech or as baby dva (before she enters mech). Mark of the Kitsune and Three-tap Tommygun seems to work fine even though they’re also after using an ability type of item. Superflexor also works fine (when dealing weapon damage, boost ability power).