I tried earlier, but after entering the 12-seed phrase, the finish button is not clickable.
I guess you selected "Standard wallet" when creating the new wallet.
As stated above by Charles-Tim, you should select "Wallet with two factor authentication".
In the desktop version of electrum, you can import your 2FA seed phrase even if you select "Standard wallet", but in the android version, you have to select "Wallet with two factor authentication".