Legacy prerendering migration guide

Okay I went through the instructions and below is what I did. However, the prerendering is still failing. I made a video and you can watch it here: https://drive.google.com/file/d/1Yf54awFrXaoXLwz3VIFSMNg_cX6P2P2c/view?usp=sharing

1: Project configuration - Build & deploy → Post processing → Prerendering → Click Configure and uncheck the “Enable prerendering with Netlify” (this is what I’m assuming the legacy one)

2: Install either the Netlify Prerender extension (that’s what I installed) or the Prerender.io extension

3: Next, I went to Project Overview and to my Extension. Then, I enabled it and saved it.

4: Finally, I went to “Deploys” and triggered a deployment.

Now, when I go to my project / website, and then go to test the extension, using this guide, and reload, the Prerender fails. Anything in my steps that is wrong?