It may be a different reason and situation for different people but this is how I overcame the 6 digit login code situation on Chrome…
Clicked the 3 dots in the top right hand corner
Clicked on Settings
Clicked on Privacy and Settings
Clicked on Third Party Cookies
Scrolled down the page to Allowed to use third-party cookies and added www.hubspot.com
This seems to have eliminated the 6 digit code request
Good luck 