Can a copy of CO certificate of origin be used for embassy c

For a batch of goods exported to Egypt, what we do with our customers is the letter of credit. The letter of credit does not require the co certificate of origin to be certified by the consulate. According to the requirements of the letter of credit, there are no problems when we take it to the bank for presentation. Now the customer goes to customs clearance. The Egyptian customs says that our co certificate of origin needs to be certified by the Egyptian Embassy in China. Now we only have a copy of CO certificate of origin, CO origin Can a copy of the certificate be used for embassy certification? Do certified copies affect customer clearance?