@subhakanta It seems that the task was created, but it has not been assigned to any user or group. It looks like the Human Task in BPM was not configured with an assignee group.
Could you please:
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Verify that the Human Task is assigned to the appropriate group in BPM.
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Check whether the corresponding group exists in Alpha Admin.
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If the group does not exist, create it.
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Add yourself to that group and test the flow again.
Please let us know the outcome after making these changes.