We are also still seeing this in the sandbox and in testflight builds. However, roughly 10% of purchase+verification attempts are succeeding.
rparrett
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Yes, we are seeing the same symptoms over here.
Everything was fine a few days ago.
We didn't change anything
Same error (21002) from RevenueCat's tool
Painstakingly bypassed any of our server-side or javascript code that is in any way involved.