One of our users doesn't want to receive the "This task was assigned to

Hi Eduardo, As per my testing please find the steps and still the ppl are receving Emails :(
1.Created a PM with 2 Edit Alert Settings for User SS with Assignment as run as admin( Task is assigned to me and Task is assigned to me and others)
2.Changed the Alert settings for me as well.
3.Generated a Task.(This Task is assigned to a Group XYZ and Myself and the User A are part of it).
4.I am not receiving any Emails but User A (for whom I have changed the Notifications) is receiving the Emails.
5.After running the PM, I have checked my Edit Alert settings and it is changed to Never and Never for both New task assigned to me and others and New Task assigned to me.
6.It has changed for User A as well. and User A and Myself are both Administrators.and the Task which is assigned is been triggered from external system.
am I missing anything.

Hi Eduardo, As per my testing please find the steps and still the ppl are receving Emails :(
1.Created a PM with 2 Edit Alert Settings for User SS with Assignment as run as admin( Task is assigned to me and Task is assigned to me and others)
2.Changed the Alert settings for me as well.
3.Generated a Task.(This Task is assigned to a Group XYZ and Myself and the User A are part of it).
4.I am not receiving any Emails but User A (for whom I have changed the Notifications) is receiving the Emails.
5.After running the PM, I have checked my Edit Alert settings and it is changed to Never and Never for both New task assigned to me and others and New Task assigned to me.
6.It has changed for User A as well. and User A and Myself are both Administrators.and the Task which is assigned is been triggered from external system.
am I missing anything.