UnknownAx, have you contacted WHMCS to green light this sale?
According to their policy:
Before any sale or transfer, the seller should contact us to notify us of the sale. Once a buyer has been found, both the buyer and seller should contact us to arrange the transfer and payment of the $20 transfer fee.
If you have a valid WHMCS licenses you would like to sell, by transfer to us we are ready to purchase ASAP today! Please PM us ASAP to complete this transaction with your valid WHMCS licenses number so we can verify your ownership. You must be the ORIGINAL owner, you must be able to get approval from WHMCS to transfer your WHMCS licenses to us, to complete the sales transaction.
No other terms are acceptable. The transfer in company URL name will be disclosed in the PM to you.