Minor security issue with Hackerone Invitations from sandbox program

How it was found

Summary: Hello, I noticed that the Hackerone team have recently enabled "Invite Users" feature to add users to organization in sandbox program. When I try to invite other users through email, I observed that there is no precautionary warning message in email stating that the invitation was sent from an unverified program on H1.

✔️ When Users are Invited to Participate/Collaborate on a report

██████

{F3136570}

✘ When Users are Invited to Join Organization

████

{F3136581}

Impact

Failing to alert users over privacy and security concern