We've created this Forum Thread with some workarounds and advice to assist you in publishing you ebook.
Mystery text box in EPUB conversion error
I'm using Word 2010 in Windows 10. I've followed instructions in detail in my document, with the right styles etc, checked for empty lines and such.
On attempting conversion I get this error message:
"Text boxes were found in the document, but are not supported in the EPUB format. Learn how to remove text boxes."
A mystery, as I didn't create any. However, I followed the instructions in the link and created a text box on the first page to Tab from. Indeed, it jumps to page 27, but nothing is visible. Tab then jumps back to page 1, and toggles to and from p27.
But there is nothing on p27 that I can see, other than the same kind of text the other pages have. Even with the paragraph marks on.
Also, while I'm at it, this is a book of poetry so I've made the poem titles Heading 2. No error msg from that, so I imagine it's OK?
Thanks for any insights!