The invoice can't be issued because the staff can't submit an account because it is Yang.
Because the staff is Yang and can't submit an account, it's normal not to issue an invoice. According to the inquiry of relevant public information, each company has relevant regulations. If the company buys something, it must issue an invoice. If the company wants to file tax returns with invoices, it can wait until the staff is ready to issue invoices before going to the company for reimbursement.