Resend email or welcome mail for new user not working

I am getting below error and not sending any welcome mail to new user

what is the steps need to follow form email configuration

An error occurred during the request. Unable to proceed.
Sending email failed

Waiting for the early response !!

Thanks !!

Does it work if you send a test email from the settings page?

No, I am not aware of settings page could you please elaborate the steps

this is what we supposed to follow

issue got resolved