I have the same issue, although I am using the same device for the last 5 years to access Hubspot, few months ago, it also started asking me to enter verification code each time I sign-in and the message I receive is as below
“We noticed you’re logging in from a new device or browser. We’re just making sure it’s you. We’ve sent a single-use code to your email address. Please enter your log in code below to access your account. Your code will expire if not used promptly.”
but both my device and browsers are same