While rewriting/testing a WPF app with Microsoft Store Addons, the purchase flow test of our test Addon stopped working reporting the error PEX-CatalotAvailabilityDataNotFound
after completion of the Store Purchase dialog (see image below):
The parent application had its certification revoked because of a change in Store Certification guidelines and we are testing purchase flow prior to re-submitting the application to the Store. But the test Addon has been active for months afterwards.
Found a support answer that this sometimes happens when the API call times out because the connection is slow or client date/time is too divergent from the Store's but that doesn't appear to be the case here.
Any help welcome.