Sales Order End Date is not getting populated Automatically

Summary:

We are trying to create a Sales order for a subscription Item and when trying to save the order, we are getting the below

Error: The request failed because you must specify the duration or contract start date and contract end date for the subscription or coverage on the order line.

We have done the necessary setups and would like to know the reason for this issue.

Content (please ensure you mask any confidential information):

We are trying to create a Sales order for a subscription Item and when trying to save the order, we are getting the below