“The item cannot be listed or modified. The title and/or description may contain improper words, or the listing or seller may be in violation of eBay policy”
I was trying to list an Apple iPod and the problem was because I had multiple payment methods selected.
PayPal is the only payment method allowed for iPods, apparently.
Once changed the listing went through just fine.
I thought someone might find this info helpful.
https://manual.iwascoding.com/gs7/en/Miscellaneous-Troubleshooting_eBay_Error_240.html