Cloning github repo error

I am not able to clone the github repository while following the steps in the blog by Donald Le https://solace.com/blog/event-driven-architecture-go-application-using-solace-pubsub/

I have SSH key set up yet I am getting the below error.

$ git clone git@github.com:cuongld2/shop-service.git

Cloning into 'shop-service'...

ERROR: Repository not found.

fatal: Could not read from remote repository.

Any help is appreciated.