Can't signup with referral code.

Can't signup with referral code.

Dear Team,

Recently i have refereed one my friends company named beatmug.com. But while signing up he is facing problem with message "We are unable to process your request now. Please try again after sometime or contact support@zohoaccounts.com".
Please see below his referral link
https://workplace.zoho.com/orgsignup.do?plan=free&referralCode=nXEQd3Xr
Can you please help on this issue ASAP.