As you are using CF7, please follow https://www.shamimsplugins.com/docs/advanced-nocaptcha-recaptcha/getting-started-advanced-nocaptcha-recaptcha/implement-in-contact-form-7/

Also please note for V3 google check so many things in background before determining bot or human. It may be browser cookie/cache or anything which making false positive.

Also in v3 user do not have any option to prove that s/he is human. There is no “challenge” for v3.

I prefer to use v2 so that if it fails user will have option to prove that s/he is human. There will be challenge.