'firebase email verification react authentication

I implemented a sign-up and log-in page with firebase auth and built the front end using react.js. Everything was running smoothly until I wanted to send test emails out to friends and family. when I made temp emails, used personal email, used my school email with VPN, etc, my authentication successfully sends the email. however, when others not physically with me send me their emails to try, it doesn't send them the verification email.

try {
   const emailSent = await userCred.user.sendEmailVerification()
} catch (e) {
   console.log(e.message)
}

where could this error be stemming from?



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