Can't access users in sandbox using instagram api

Question

I have created a client in Instagram and I have 2 users in its sandbox. I can successfully authorize my client and receive data from self endpoint. But When I try to change the user to the ones in the sandbox I receive a page that says

Sorry, this page isn't available.

The link you followed may be broken, or the page may have been removed. Go back to Instagram.

For example when I try this:

https://api.instagram.com/v1/users/self?access_token=TOKEN

I receive a proper response, however when I change the user:

https://api.instagram.com/v1/users/sudomakeinstall2?access_token=TOKEN

I receive the page isn't available.

Note that the user is indeed in the sandbox

Answer 1

You should not use username, it should be user-id in place of self.

user-id for username @sudomakeinstall2 is 422703870

replace sudomakeinstall2 with 422703870 and try API call