Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
The Planner mobile app should normally sync with the desktop/web version automatically.
If the task isn't appearing on your phone, make sure you're using the same Microsoft 365 account and the latest version of the Planner app. You can also sign out and sign back in.
If the issue only affects the "New" task chat, it may be a limitation or service-side issue. As a temporary workaround, try accessing Planner from the web version and check Microsoft 365 Service Health for any reported issues.