Embedding Closed Captioning into MPEG4

I am new to the group but I need HELP.
I am submitting a video to broadcast on tv and I need to embed closed
captioning into the mpeg4. So far I haven't been successful. Is there a way it can be done in Adobe Premiere Pro CC?

I'm not a billion percent positive that mp4s will accept closed captioning, but if that's what the broadcaster is asking for then I guess it must be possible. Here's a quick start guide to the captions workflow in Premiere. If you search Adobetv you'll probably find some good videos too.

[helpx.adobe.com]