Can I approve a sign-in with one tap from the notification?
No, on purpose. You open the prompt and check the two-digit number matches the one on the sign-in screen. A button on the lock screen would let anyone who had your password keep trying until you tapped yes to stop the buzzing.
From the guide Using the Seayora app as a landlord or property manager.
Approving sign-ins on your phone
Once the app is signed in, signing in to your account on a new computer sends a prompt to your phone instead of a code to your inbox. Both screens show the same two-digit number. Check it matches before you approve. If the sign-in was not you, “No — secure my account” on the same prompt stops it. See “Approving Sign-ins on Your Phone”.
Read the whole guide: Using the Seayora app as a landlord or property manager