Trying to add time estimates to task fields but get error for description

[Deleted user]

I'm trying to modify the fields of my tasks to include time estimates but when I try to save I get an error regarding Description: 

Already exists. Use the previously-created field or try another name.

Any help would be appreciated.  

[Bhushan Nagaraj]

Hey Robert,

Unsure where you are seeing this error. Is this on the issue screen that you are trying to add the Jira provided "Time Tracking" field?

Regards

Bhushan

[Deleted user]

Bhushan, 

Thanks very much for your response. 
I'm seeing this in

Projects/My Project/Project Setting/Issue Types

When I try to modify an issue like tasks I see the attached. 

[Bhushan Nagaraj]

It seems like you are experiencing a similar issue to @Nir Yungster at https://community.atlassian.com/t5/Jira-questions/Cannot-configure-Issue-Types-in-Next-Gen-Products-any-ideas-what/qaq-p/1161046

Can you have a look at the solution he has proposed and check if this resolves the issue?