First of all, what you're sending to the oscilloscope is a sinewave oscillator, not your granular sampler. Second, we cannot know what is inside the oscilloscope subpatch (you can tell it's a subpatch because its name starts with "pd"). You can right-click on it and select "open" to see what's inside and why it doesn't show anything.
Wild guess, the "samples 1" is probably the number of samples to display. Only one sample is a single value, while you want a bunch of values to display. Try raising the number to something like 512. Otherwise, post a screenshot of the inside of this subpatch.

@alexandros this is the inside

The dashed box around speedlim means that you don't have that object. You should have gotten a message in red on the pd console to indicate that problem. There are several external libraries that include speedlim. You need to decide which one to use. Where did you get the oscilloscope subpatch? It would be a good idea to use the same speedlim that they used.

@jamcultur got it from a old post here

@jamcultur unless I make a oscilloscope myself, I'm not very familiar with

@mosef123 You're also missing edge~, so you probably need the cyclone library. There are a number of tutorials that tell you how to make your own oscilloscope. Here's one: