Hi,

Thank you for your feedback!
Sorry we don't have such a phone, which makes it difficult for us to test. But please first make sure that normally new tag can be created when you create or edit a task, and click 'Tags' on task editing page, and type a new tag.
When you say you are unable to create a new tag, do you mean you couldnot even see the 'New Tag' hint when selecting a tag？Or you could see the hint but you couldn't type into it? Or you typed but couldn't save it into the task?

Could you please explain a bit detailedly so that we may help better？

Thank you！
Have a nice day!