Why neovim cannot recognize ctrl+tab key?

I tried to map ctrl+tab key into changing current tab, like chrome and firefox.

nnoremap <C-Tab> :+tabmove<CR>

But it could not work well. Result of the investigation, I find that nvim cannot detect ctrl+tab key because of some low layer problem. Do you know why nvim cannot detect ctrl+tab, and how to make it detect?

In a terminal, the Tab key generates the ASCII code 9, which corresponds to that of Control-i. Therefore the combination Control-Tab does not exist.

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