Why am I getting a "CRM account already in use" error while integrating first time with Commerce?

Why am I getting a "CRM account already in use" error while integrating first time with Commerce?

Check whether you have integrated this CRM account already with any one of the Zoho finance apps (Zoho Books or Zoho Invoice, Zoho Expense, Zoho Subscriptions, Zoho Inventory). If the error persists, don't hesitate to contact support.