User unable to add tasks to proejcts

Often when this happens, it's because the column sort isn't set to the row ID (first column) or a filter is applied to the list. It looks like - from the arrow in your screenshot - that the column is used for the sort, so is it possible that the user has a filter applied to the list? 

What happens when the user clicks the Add Task button at the top? Are they able to add tasks to the project?

Typically, sorting or filtering/grouping has been applied if the "Add More Tasks" button at the bottom is gone but the New Task button is visible at the top. 

If the user can add tasks through the new task button, and has confirmed no filters/groupings are applied then I would reach out to support so they can click into your actual instance to troubleshoot.

@charlieham Hi there, just checking in. Were you able to get this resolved? If one of the replies above helped, even if it didn’t fully solve the issue but pointed you in the right direction, marking it as accepted can still guide others who may face a similar question. And if you discovered another way to fix it, sharing your approach would be a big help to the community. Your follow-up not only closes the loop but also ensures others benefit from your experience. Thanks again for being part of the conversation!