You might be unable to see invoice periods in CM mobile due to user permissions, system settings, or syncing issues, which can restrict access to billing details and affect your ability to manage invoices effectively.
If you are unable to see invoice periods in finance manager, make sure you have selected a contract from the drop-down menu, as some periods are linked to the contracts themselves.
After adding the contract into the contract filter box, the periods should be visible. If you are still unable to see the invoice periods, new invoice periods may need to be added.