What UDOIT / Canvas may flag: text that visually looks like a list but is not coded as a real list.
Use the list buttons instead of typing the appearance of a list.
Choose the right kind of list.
Use a numbered list when sequence matters. Use a bulleted list when it does not.
Select the items and use Canvas's list tool.
Rich Content Editor
Do not type dashes or numbers manually to imitate a list.
Real list formatting tells assistive technology that a list exists and how many items it contains.