Please follow below steps to automatically regenerate a task in Outlook.

1. In the Tasks view, please click Home > New Task to create a new task.

2. In the new Task window, please click Task > Recurrence. See screenshot:

3. In the popping out Task Recurrence dialog box, please do as follows:

(1) In the Recurrence pattern section, please check Daily, Weekly, Monthly, or Yearly option as you need;
(2) Check the Regenerate new task 1 week(s) after each task is completed option. Note: the week(s) will vary depending on the recurrence frequency you specified in above Step (1).
(3) In the Range of recurrence section, please specify the date range of recurrence as you need;
(4) Click the OK button.

4. Now you return to the Task window, please add subject, start date, end date, status, priority, etc. as you need, compose task note, and click Task > Save & Close.

So far you have created a new task which will be regenerated automatically in certain days/weeks/months/years after each task is completed.

Create a monthly/quarterly recurring task in Outlook

Create a bi-weekly/fortnightly recurring meeting in Outlook

Create a recurring meeting on 1st and 3rd Wednesday of every month

Create a meeting recurring every other day excluding weekends