Thanks I believe I find the reason: this coblock form only supports v3 reCAPTCHA, else caused coblock js error.
the console has following error: Uncaught ReferenceError: grecaptcha is not defined
at coblocks-google-recaptcha.js?ver=3.1.14:1:1
And the error happened in following source code
grecaptcha.ready(( () => {
const e = Array.from(document.getElementsByClassName(“g-recaptcha-token”));
e.length && e.forEach((e => {
grecaptcha.execute(coblocksFormBlockAtts.recaptchaSiteKey, {
action: “coblocks”
}).then((c => {
e.value = c
}
))
}
))
}
Hope this can help to fix the unexpected error
i installed brevo wordpress plugin, and email can work, like in reset password