Sharepoint connection error , no permission to access the site

Recently, I am working on lightswitch project with Office 365 and  sharepoint. I have followed the example provide by Lightswitch team. When I try to validate a developer site from sharepoint,

I got the following error if i use my office 365 E3 plan trial (free from my reseller partnership with Microsoft).

I have been using the default admin account of our office 365 Account

However, the validation will work if I use another Office 365 trail account (Free for one month).

 Please help