Not sure if this is a bug, but every other telerik product including previous fiddler worked with my telerik login.

Steps:

I'm not behind a VPN. 

1. I just downloaded Fiddler Everywhere,
2. ran it,
3. tried to sign in and it gives "user does not exist".

This is using the same credentials I used to login to Telerik to write this ticket.

I couldn't find any documentation saying I need a separate account.

Feel free to close or push to Feature Request if this is intended behavior.