Just noticed this today as well and it’s definitely quite frustrating needing to go to the desktop to duplicate a task. Need to do so that has tons of sub-tasks and need to do it while on-the-go.
Would definitely be a super useful feature to have on mobile. Please consider 
Adding my vote for copy/duplicate on iOS. Incredibly frustrating.
I work on an iPad Pro as my main device so this is essential.
The baselime use of assama for me is all based around 3 tasks that I need slight variations on, I use the mobile app all through the day to manage existing ones but making new copies being desktop only is unacceptable
Wow…its sad to see that this basic feature has been requested since 2018 and it still hasn’t been updated. I liked this platform but if a simple command like duplicating a project or task isn’t available on the mobile app, it makes asana worthless to me. Going back to Clickup.
Please add this feature.
Oh, God! Two years now and still not duplicate of task feature. No wonder that Asana is owned by Google 
How is it possible that this still hasn’t happened? This is such a necessary task.
Well well well, 2 years later and still no updates on duplicate task on Mobile
At least allow us to use the web version of asana via the browser until you figure this out (and yeah, two years? Really? That is INSANE
Pretty sad that we are still waiting on this feature. It seems to be endlessly requested and it can be done on literally the other iterations of Asana. My organization relies HEAVILY on Asana and Templating for projects and is often on their mobile devices and as a PM not being able to duplicate a template at a moments notice on mobile or my iPad (where I do most of my work these days) is nothing short of maddening.
Asana Team please help your loyal clients and make this update. We have expected it for so long and yet no update still. Whats the actual hold up? Are you working on it? When will this clearly useful and highly requested feature be available?
It has been 3 years that we are waiting for this feature. The majority of my team works on mobile devices. Can we get an update or whom to contact about this feature?
Same demand, could you keep us informed ? Thanks
As a lot of the comments above, our team with task checklists and we need the ability to spawn a new task based on an existing template. I think if Asana is targeted at users performing checklists then this is a fundamental requirement. Thanks