Along my travels as a certified Microsoft Dynamics 365 (CRM) consultant (customization and configuration) i am been over 5 times by different sets of user how to re-open activities that has been mistakenly closed or completed or need to be edited or amended.
Now there is a good reason you can’t do this out of the box and that reason is that activities and their status serve as a log or audit of what happened at a certain point in time however mistakes happen and i’m not sure why Microsoft doesn’t at least allow a configurater or system administrator access to do this.
What i decided to do was spent some of my time create a Dynamics 365 Solution (created in July 2019) that can easily upload to your instance of dynamics online or on-premise which will add the ability to re-open activities. Specifically Tasks, Phone calls, Appointments and Emails
Ability to re-open activities. Specifically Tasks, Phone calls, Appointments and Emails
Note: This solution installs 4 custom workflows that can access via the Flow Menu option (located on the top menu bar) on both the individual activities screen and from the activities (list) views
Important note: Reopening an activities will mess with the original date stamps, there will be no history of the date of first open, first complete, re-open, and then complete again. You need to create your own history or you can use audit history if this is an issue