If you are signed into three Google accounts simultaneously, adding ?authuser=0 forces the page to use the primary account. This is common in Google’s internal redirects for Drive, Gmail, and Photos.
The Google contributions profile URL serves as a central dashboard for managing user interests, saved search collections, and Knowledge Panel verifications using the primary logged-in account. This page, distinct from Google Maps profiles, allows for the management of topics followed in Discover and the addition of authorized users for entity management. More information is available on the Google Support website. Google Help Get verified on Google - Knowledge Panel Help https wwwgooglecom search contributions profile authuser 0