By default, WHMCS does not have any kind of restriction on user registration. That is, without email verification a customer is able to perform all tasks. But using Email Verification Extended your customer won't be able to perform any tasks.
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The best place to start if you need help with a specific product is to contact the developer. All WHMCS Marketplace developers have both a website and support URL listed.
MSG91 WHMCS SMS plugin gives you the power and flexibility to stay connected with your customers by sending them an SMS and OTP's for 2FA at the crucial steps that matters the most.
Transactional email support for Sendgrid, Mailgun, Postmark, Sendinblue, Mailjet, Sparkpost, Mandrill and AmazonSES
More Advanced SMS System (Two-Factor Authentication)
Professional business e-mail for your users
Verification Your Email