You can accept the new property invitation from your existing user profile.
If you get invited to a property, and you're already a registered user in another different property, good news! It's really easy.
- Log into the Aquana Platform
- Go to your Profile (click the username in the top right of the page)
- Look for the "Pending Invitation", and click "ACCEPT"
Now you'll see multiple properties available in the top Property Selector. You can toggle between all the properties you are involved with.