Are old users eligible for introductory pricing? We are introducing a free trial using the introductory pricing provided by Apple in StoreKit. The subscription has been available for a long time. My question is, if a user had subscribed before the introduction of Free Trial and has now cancelled the subscription, will this user be eligible for Free Trial now?

https://developer.apple.com/documentation/storekit/in_app_purchase/offering_introductory_pricing_in_your_app

In the above link, under the subheading Determine User Eligibility, in point 2

Will either Subscription Trial Period or Subscription Introductory Price Period be true for the above user?
Probably, yes. Given the quote from Apple's documentation below (emphasis mine):


  Based on the receipt, you will find that new and returning customers
  are eligible for introductory price or free trial discounts as
  follows:
  
  
  New subscribers are always eligible.
  Lapsed subscribers who renew are eligible if they haven't previously received an introductory price for the given product (or any product
  within the same subscription group).
  


However, do ask App Store Connect Inquiries directly. They will be able to provide an absolute and authoritative answer.