Problem of Import Client Users From CRM and or Expense

Problem of Import Client Users From CRM and or Expense

I am premium plan user on Projects. I have about 500 customers on Expense and CRM that integrated with each other. According to at below link, I am trying to import clients from CRM, system not allowed to select any customer. If I import from Expense, system allowed to import 21 clients. I need your assistance.

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