AppCheck: low ReCaptchaV3 score on some (valid) devices. How to fix? #7779
Description
Operating System
Chromebooks
Browser Version
see below
Firebase SDK Version
Firebase SDK Product:
AppCheck
Describe your project's tooling
Flutter/dart, firebase_core: ^2.4.1 (not sure how this maps to JS SDK versions)
Describe the problem
Some users run into an AppCheck error, apparently because they get a low Captcha score. They have an up to date browser, their IP is not blacklisted so I have no clue how I can help them.
Steps and code to reproduce issue
I have successfully integrated appCheck on Firestore and, according to https://www.google.com/recaptcha/admin, there are about 5% suspicious requests.
My app is used in schools (by pupils) and some schools report, at startup, an error stating "Requests throttled due to 403 error. Attempts allowed again after 01d:00m:00s". This happens on almost all of their devices.
To analyze this, I make a call to recaptchaV3 myself when this happens and, as expected, I get a low score
{"success":true,"challenge_ts":"2023-11-13T14:05:40Z","hostname":"<myhost>","score":0.1,"action":"submit"}
The problems seem to be school specific so I would like to understand what they can do to get a higher captcha score.
Is it possible that they get a low captcha score because eg 30 pupils start our app at almost the same time?
One other option that I checked was an outdated browser version but that doesn't seem to be the case according to this
{browserName: BrowserName.chrome, appCodeName: Mozilla, appName: Netscape, appVersion: 5.0 (X11; CrOS x86_64 14541.0.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Safari/537.36, deviceMemory: 4, language: nl-NL, languages: [nl-NL, nl, en-US, en], platform: Linux x86_64, product: Gecko, productSub: 20030107, userAgent: Mozilla/5.0 (X11; CrOS x86_64 14541.0.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Safari/537.36, vendor: Google Inc., vendorSub: , hardwareConcurrency: 2, maxTouchPoints: 0}
Is it possible to contact the recaptcha team and to analyse this in more detail?