Invalid token with the same user, Oauth 2
<p>I have the next problem with Oauth 2:</p>

<p>-Mobile (A): Get code and get token. User can use the app. No problem.</p>

<p>-Mobile (B): Get code and get token. User can use the app. No problem.</p>

<p>Now, I return to Mobile(A), and I got token invalid! what is the problem? Once user log in in Mobile (B), token from mobile (A) was lost?</p>

<p>Thanks and sorry for my poor english.</p>
