You aren't able to completely delete a user but you can deactivate a user. Deactivating a user removes their access.
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Pro Tip! Reach out to Support to Unlink the Deactivated Users Infusionsoft ID so that you can replace it with a new user.
Deactivate a user
Navigate to Admin > Users.
Click Users Name in Blue > Scroll Down.
Deactivating a user makes a user license available. The only exception is when partners are deactivated (users with a blue P next to their name), since partners do not require a user license.
What happens to the contacts, tasks, opportunities, and notes assigned to a Deactivated user?
When a User is deactivated the completed task will be removed. It will only ask who to assign the PENDING Tasks. However, notes will not be affected when a User is deactivated.
What happens if I reassign to the wrong User?
Make sure you are assigning to the correct User because once the action is processed there isn't a way to Undo. However, you can manually reassign to another User.
Video Walk through
Note: Video has no sound