This is originally Fedora bug https://bugzilla.redhat.com/show_bug.cgi?id=1045191 but it's also applicable to the vanilla sources:

Description of problem:
When using ssh-copy-id to copy the ssh public key to a remote server, if the account on the remote server uses a shell that is not based on sh or bash (like tcsh), then the script will fail with the message 'Ambiguous output redirect.'. This message is caused by the redirection of STDOUT and STDERR using the sh syntax 2>&1 which is invalid for tcsh.

Specific details:
In the file /usr/bin/ssh-copy-id at line 275 we have the following:

if type restorecon >/dev/null 2>&1 ; then restorecon -F .ssh .ssh/authorized_keys ; fi" \

This command is being executed on the remote machine using the default shell of the remote account. If the remote shell is tcsh (or any other shell that doesn't support the 2>&1 syntax), the
     if type restorecon >/dev/null 2>&1 ;
command fails.

Version-Release number of selected component (if applicable):
6.2p2-6.fc19

How reproducible:
Always

Steps to Reproduce:
1. Create an account on a remote machine using tcsh for the shell (or any other shell that doesn't support the 2>&1 syntax)
2. Generate an ssh key on the local machine
    ssh-keygen -t rsa -b 2048
3. Run ssh-copy-id on the local machine (the command below assumes the login id is the same on both machines
    ssh-copy-id x.x.x.x

Actual results:
The script exits with
    Ambiguous output redirect.

Expected results:
The script successfully runs with 
    Number of key(s) added: 1

    Now try logging into the machine, with: "ssh 'x.x.x.x'"
    and check to make sure that only the key(s) you wanted were added.

Additional info:
I was able to fix this bug by basically specifying that the ssh command should use the sh shell instead of the default shell of the remote account. The changes I made to the ssh-copy-id script are as follows:

Starting at line 273, change the lines
    umask 077 ;
    mkdir -p .ssh && cat >> .ssh/authorized_keys || exit 1 ;
    if type restorecon >/dev/null 2>&1 ; then restorecon -F .ssh .ssh/authorized_keys ; fi" \

To the following single line - add "exec sh -c" at the beginning and surround the commands in single quotes
    exec sh -c 'umask 077 ; mkdir -p .ssh && cat >> .ssh/authorized_keys || exit 1 ; if type restorecon >/dev/null 2>&1 ; then restorecon -F .ssh .ssh/authorized_keys ; fi'" \

I'm not sure if this is the best fix, but it works regardless of the remote shell.