I can't delete characters in tmux on macOS

I have searched around and the closes thing I could find to my issue is this: https://stackoverflow.com/questions/23848061/cannot-get-delete-key-to-work-with-tmux-and-osx I am running multiple versions of OSX and macOS and I am using iTerm2. When I go into a tmux session my delete key does not work. I also try to use Ctrl+H and Ctrl+?, which those are not doing anything for me. In iTerm preferences->keys, I have delete sent to ^H. In preferences->profiles->keys, I also have the box checked, Delete key send ^H. Vim is able to delete in tmux but from the command line I can not. ## .tmux.conf # Set default term set -g default-terminal "xterm" # remap prefix to Control + a set -g prefix C-a unbind C-b bind C-a send-prefix # force a reload of the config file unbind r bind r source-file ~/.tmux.conf # Start number at 1 set -g base-index 1 # UTF-8 set-option -g status-utf8 on # supposedly fixes pausing in vim set -s escape-time 1 # set default terminal set -g default-terminal "xterm-color256" # Vi copypaste mode set-window-option -g mode-keys vi bind-key -t vi-copy 'v' begin-selection bind-key -t vi-copy 'y' copy-selection bind p paste-buffer unbind % unbind '"' unbind [ bind | split-window -h bind - split-window -v bind ^C-s copy-mode set-option -g default-shell /bin/zsh setw -g history-limit 10000 #quick pane cycling unbind ^A bind ^A select-pane -t :.+ # Clear pane bind C-l send-keys -R \; clear-history # add airline to tmux status bar if shell "test -f ~/.tmuxlinesnapshot" "source ~/.tmuxlinesnapshot" Any help would be much appreciated!