Create Recurring Series of Tasks Checkbox is Grayed Out or Unavailable When Editing or Creating Salesforce Task Records

This article explains why the 'Create Recurring Series of Tasks' checkbox is unavailable or grayed out in Salesforce, and provides the steps to enable it.

Create Recurring Task Using Global or Custom Actions in Lightning and Classic

In order for the 'Create Recurring Series of Tasks' checkbox to display during the Task creation process, the 'Delete Series' and 'View Series' actions must be added to the Mobile & Lightning Action section of the page layout. For more information on adding these actions to the desired page layout, see the related article on enabling recurring tasks or watch the Salesforce Support video linked in the Additional Resources section below.
Since it isn't possible to add these buttons to an Action layout, it is not possible to display 'Create Recurring Series of Tasks' on the Action layout.

Checkbox for Recurring Task is Grayed Out When Editing an Existing Task

This is expected behavior. The checkbox for recurring tasks can only be selected when you are creating a new Task. It is not possible to convert an existing single Task into a recurring series by editing it.

Make Your Voice Heard

• Vote for the idea: Creating recurring tasks with a New Task quick action
• Vote for the idea: Creating Recurring Tasks by Editing Existing Tasks