Hmm it looks like SN us is blocking the string after the semi colon
slash:j81i8qqk1wwdweu1utoxmqcwo1aemnras9kra3fh4xxgfdf5eaqo
j81i8qqk1wwdweu1utoxmqcwo1aemnras9kra3fh4xxgfdf5eaqo
reply
You can use a backslash before the ":" character:
key\:value
key:value
reply
slash:j81i8qqk1wwdweu1utoxmqcwo1aemnras9kra3fh4xxgfdf5eaqo
reply