The number of side missions in "Assassin's Creed: Shadow" is very large. The tea bowl side missions of Rikyu are one of them. The process of this mission is relatively long. If you want to take the mission, you need to go to the vicinity of Sukkoji Temple in Kyoto in the Yama Castle area. Open the map and you can see the location.
How to do the tea bowl side mission for Rikyu by Assassin's Creed Shadow