Task is not available error when using processTaskLink()

I have created Tempo Task Report which gets data from Portal Task report. This report lists all task which are assigned to the Group.
I am using processTaskLink function to create link my task. But when I am clicking on task it shows The requested task is not available error. but same task is available under tasks tab.

I am working on Appian 7.7



OriginalPostID-142055

OriginalPostID-142055

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