Others cannot access their account through the autodiscovery on my PC. My account log-in will work on their PC's. My log-in will work when accessing Gmail directly from the Google page. So I do not think it is the account itself. The gmail account log-in will not work using the pocket companion. Are there Internet or security settings that prevent a connection specific to your application?
I'm experiencing the same problem on my Motorola Xoom. I've tried both my regular gmail account as well as my Google for Applications domain account and both seem to fail logging in. I did have success when I tried connecting the first time on my home network both in logging into my google account as well as remotely accessing my desktop. When trying it at work I have not yet been able to sign in to my google account. Google talk does seem to work from my Xoom.