Looking for help to solve the following issue:
I have created Persons and grouped those persons in one team
I created a task assigned to the whole team.
I need to create a new column with type “Person” to automatically assign the team member who performed the update on this task.
The objective is to know which team member finished this task and to prevent multiple members to work on the same task.
Hi @rania.akef 
You should be able to add a column called “Last Updated”. That will tell you the person and the time that the last action was performed.
I hope this helps! 
The Update Magic #1 app can to that using this recipe:
Jim - The Monday Man
Update Magic #1 – New update enhancement toolbox
Column Magic 
– The magical columns toolbox
We Create Custom Apps, Integrations & Automations for monday
If by “update” you meant change, you could use Column Magic with a custom recipe like this:
Jim - The Monday Man
We Create Custom Apps, Integrations & Automations for monday