Instagram API: The access_token provided is invalid

Question

I have registred a sandbox user. Now I am trying to use it, but I recieve \"The access_token provided is invalid\". Sample request:

https://api.instagram.com/v1/use

Answer 1

For me the access token Instagram generate is too short: they gave me something like this:

d2c387d768ec4d619306807c53bbf92b

it should be:

2940736713.1677ed0.31bb22b2b0f84befacc79c6afd025134

I used this site to generate it: http://instagram.pixelunion.net