Task Manager Approval from 2 application

Summary:

We have 2 application one for manpower and other for fin

In the first App for Manpower we are using the default approval process

In the second App For Fin we are using the task manager approval process

In FIN APP;

what we need is that the Approval user will approve just one task which is a dashboard in FIN and these approval to be sent to the other App (Manpower)

We tried the Auto Approve Rule in Task manager linked to Approval task in Manpower app but it didn't work

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