Moz says "Missing rel=canonical tag"

We just received an error from moz on all of our sites that we installed Hummingbird, WP Smush, and Defender on. Some of our sites dropped 40+ in ranks and the reason is because of this: Crawl Issue (Missing rel=canonical tag)It looks like you're not using the rel="canonical".

Here are two: https://spadedesignlab.com/ and https://bobaloompia.com/