Please help me with the XML code. While adding a campaign I am getting Error 400.
It looks like the problem is coming from your EmailContent and EmailTextContent fields. Because of the format of the XML, any HTML tags need to start off with < instead of the actual < symbol. Also, the EmailContent needs to be in a valid HTML format, so be sure to add html and body tags. So, those two tags should look like this:
Let me know if you have any other problems. Thanks!