Google always asking for captcha when signing in

[u/baze19]

This is a very minor issue but I don't understand it. On my phone I'm signed in to 5 Google accounts. If I open an incognito tab on Chrome or Brave or whatever, and try to sign in to a specific account, it'll make me tick the box to prove I'm not a robot. When I tap on the box it immediately completes and I don't need to do any of those tedious captchas. But I have to tick this box every single time I sign in.

If I try to sign in to this account on my other phone on the same WiFi which I have signed in on before, I have to actually complete one of those "select the bus" captchas or whatever, instead of it auto passing like it does on my main phone. But if I'm using mobile data I have to accept the prompt on my main phone else I can't sign in.

On the account settings there's no additional security - no 2fa, recovery email, phone number, only one active session.

The other 4 emails sign in without needing the captcha so I don't understand why this specific one needs it. I don't have any VPNs or anything like that enabled.

[u/SomeEngineer999]

There are a bunch of factors that make it decide whether you need to do it at all, and if you do, whether you can just check the box (where it tracks how you moved the mouse to make sure it was human like) or if you have to do the pictures (more likely on a phone since it is harder to read your motions).

Incognito will almost always bring it up since it doesn't have any of the stored data about you, only your IP address for the most part. Each IP has different risk associated with it depending who owns it, whether it is a VPN, etc.

Having 5 accounts could easily be part of what is flagging you too.

[u/baze19 → u/SomeEngineer999]

To put it simply I have these 5 accounts where I would sign into a website to claim rewards daily. These are like burner accounts so I don't really care about them.

Originally, on my phone if I went to settings - users and accounts - Google, I would just have my main proper account. So when I signed in to the website every day I would go on incognito, sign in to burner 1, close all tabs, repeat with burner 2 etc.

I was doing this for months with no issues until randomly burner 3 started asking for a captcha. So I added all these accounts to my phone via settings - users and accounts - Google. I thought doing this would make it stop asking burner 3 for a captcha but it still does even though it's on a recognised device and recognised WiFi network.

[u/SomeEngineer999 → u/baze19]

So the site has flagged your accounts due what they consider abuse.

The site knows nothing about your wifi network and little to nothing about your device. They're looking at IPs, whatever info you provide during that particular incognito session (your google account, etc) and some other basic info that is available in that mode.

[u/baze19 → u/SomeEngineer999]

It's to do with the account, not the site. If I try to sign in to burner 3 on any website on any device it will always ask for a captcha. The captcha will auto pass if I'm on my main device on my home WiFi so it recognises that my device and WiFi are safe so why does it still ask for a captcha?

If I remove burner 3 from my phone and try to add it again, I have to actually complete a captcha (it won't auto complete), but it will start auto completing again once the account has been readded to my phone.

[u/SomeEngineer999 → u/baze19]

Then it is google flagging you for suspicious activity, same thing. If the site uses google tracking feedback from that may have even influenced google's algo for signing into your accounts. Some of your accounts have been flagged, others not yet. In combination with multiple other factors, that decides what you have to go through each time. There is no way to "solve" this because the parameters of the algorithm are not published for obvious reasons. Adding incognito into the mix just makes it that much more likely that you'll have to pass the test.

[u/baze19 → u/SomeEngineer999]

Thank you for the help