Get Tasklists, missing parameters

I am returning the project object that contains the links to the other project parts..

If I try and get tasklists from the link provided, it returns error: 6831, Input Parameter Missing.

I've tried debugging using Postman but it returns the above error.

I've checked my portal and project ids to make sure they were correct.

Here is the URL string I am using:

https://projectsapi.zoho.com/restapi/portal/[MY PORTAL ID]/projects/[MY PROJECT ID]/tasklists/?authtoken=[MY AUTH TOKEN]

If I remove the /tasklists/ from the above URL it shows me my project properties so I know that part is correct. What parameter am I missing?

Thanks.

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