Problem Description:
One of our sales agents in our organization is unable to sign in to Zoho Mail.
When attempting to log in, the following message appears:

This mobile number has been marked as spam. Please contact support at as@zohocorp.com
@Anonymous User

note: This is the first time this number has been registered in Zoho.

Request:
Please provide the steps to enable access or properly register the account so the agent can log in to their Zoho Mail account.