In our application, tasks are assigned to users/groups and a person was able to view task even if its accepted by other user. But since our upgrade to 22.1 we are getting error if other user is opening it. Also when trying to view form through the instance we are facing the issue. Refer attached screenshot for error message.
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This is a known bug that's already been addressed by Appian in a very recent hotfix. Please open a support case and ask them to deploy the relevant hotfix to your environment(s) when convenient for you.