Most likely there is some filter that is preventing the task / project from being visible.
For e.g. The task / project is in “Draft’ state and the report’s filter (State) does not have this selected.
If you are an admin user, you can edit the report to check the possible filter.
After revising the filters, the task / project will be shown.
The other probable reasons could be:
- You have not allocated the resource on task itself.
- The resource is not looking at correct reports.