Can't see sandbox Subscription Management page

https://developer.apple.com/documentation/storekit/in-app_purchase/testing_in-app_purchases_with_sandbox

I try to execute 1 point in the Begin Testing chapter from the documentation at the link above, but I do not see Subscription Management page. Has anyone encountered such a problem? How can it be solved?

I can't find it either. I followed these instructions: https://developer.apple.com/documentation/storekit/in-app_purchase/testing_in-app_purchases_with_sandbox/testing_disabling_auto-renew

Does anybody have a solution?

Same problem with iOS 12.5.5 on iPhone 6

Can't see sandbox Subscription Management page
 
 
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