@Cheong, Jia Chen (Jane) (DXC Luxoft) ,
If you haven't tried this already, please try the following steps:
- Try this in incognito browser mode
- Try this on a different browser
- Try this on a different Outlook account
Why am I getting a "Sign into invited account" error when attempting to login to a sandbox?
As reported by @Polaris , it appears that there is a login issue with the learn sandboxes when using Hotmail email accounts that have been merged with Outlook.com. Using a separate account that was never merged with Outlook.com is a temporary workaround while we work on a fix.
Issue summary:
- "Sign into invited account" error when logging into sandbox
- Temporary workaround is to use a different account
-- Reference