Schluter Shower Pan Leaking

I recently installed the Schluter shower pan and thought I did a good job after watching a ton of videos and going through the handbook. Waited over 48 hrs to do a flood test and of course it leaks. This is my first big diy project and feeling pretty disheartened. How can I figure out where the leak is coming from? What are some options to salvage this without having to pull it all out? I was thinking of adding more KERDIband along the seams and corners but I don’t know if that will just be more wasted effort. Thanks in advance and please be kind.