I have five Google accounts signed in on my phone. When I open an incognito tab in Chrome, Brave, or another browser and sign in to one particular account, Google always shows the "I'm not a robot" checkbox. Tapping it usually verifies me immediately, but I still have to do it every time. On another phone connected to the same Wi‑Fi, Google sometimes requires a full image CAPTCHA instead. When using mobile data, the sign-in may also require approval from my main phone. The account has no two-factor authentication, recovery email, or recovery phone configured, and it is the only active session. My other four accounts sign in normally. I do not use a VPN. These accounts are mostly used as separate burner accounts for signing into a website daily, and the CAPTCHA began appearing for this one account after months without problems. Adding the accounts directly to the phone's Google account settings did not stop it.
2 Answers
Google’s CAPTCHA decision is based on a risk score, not just whether the device or Wi‑Fi is familiar. Incognito removes cookies and other browser data, so Google has less history to use and will commonly ask for verification. The IP address, login pattern, number of accounts, device signals, and how frequently the accounts are used can all affect the result. Repeatedly signing into several accounts in succession—especially accounts used for similar daily activity—may make one account look automated or suspicious. There is probably no setting that forces Google to stop asking; using a normal browser profile, keeping cookies enabled, avoiding rapid repeated logins, and securing the account with recovery details or two-step verification may help over time.
Being on a recognized phone or network does not guarantee a CAPTCHA-free login. Google evaluates the account and the current sign-in behavior as well as the device. If this particular account has developed a higher-risk reputation, adding it to the phone will not necessarily reset that. Check the account’s security activity for unfamiliar sign-ins, change the password if anything looks wrong, and avoid repeatedly logging in and out through private browsing. If the pattern continues, it may simply be Google’s permanent risk challenge for that account.
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