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https://nishantrana.me/2017/10/23/a-validation-error-occurred-the-value-of-membercount-on-record-of-type-list-is-outside-the-valid-range-exception-in-dynamics-365-crm/
A validation error occurred. The value of 'membercount' on record of type 'list' is outside the valid range exception in Dynamics 365 (CRM)