It is really a strong requirement to have a feature for an "autonumbering" - field...there are solutions out there in the wild, but it would be very nice to have this feature out-of-the-box in Crm.
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Thank you for your feedback. We released this feature in Dynamics 365 (online), version 9.0. Please refer to the following link for more information:
https://docs.microsoft.com/en-us/dynamics365/customer-engagement/developer/create-auto-number-attrib...
Thanks,
Srikumar Nair
PM, Microsoft