What e-mail did you use in your Impulse account? What e-mail is used in the Paypal account?
If the Paypal email is different, Entrenchment went to that one so you logging on Impulse won't see it because it's on a different account.
You need to send support an email with your Impulse account, the Paypal email, and probably the order number from the receipt that was mailed, and then they'll combine them so you'll have the Entrenchment registration on your Impulse account.