I'm trying to make endless auto scrolling text Animation in Figma using after delay but its not working. After prototyping the text is still freezed

Are you using Smart Animate?
The trick is, while changing from 1 variant to another,
‘After delay’ will be 1ms
Smart Animate, Linear, 3000ms

The second variant should be positioned differently (x axis)
Check out this response.

Or, you can share screenshot of your canvas and interactions for better understanding.

See if there’s any space between the duplicated texts. Remove the spaces and try it worked for me!