Hi!
Please make sure to check the following options:
– On the Search Instance, General Options -> Sources panel, if the correct post types are selected: https://i.imgur.com/FWiFseY.png
– On the Index table options submenu, check if the correct post types are selected: https://i.imgur.com/ss1nS5C.png
– On the Index table options submenu, check if the correct taxonomy terms are selected to be indexed as well: https://i.imgur.com/tJ2JbTl.png
After making any changes, make sure to re-create the index table as well. If these does not work, you can add temporary admin access, and I will check your configuration.