How can I make my module available to students? (Module is greyed-out and students say they can't see it.)

This refers to Moodle 3.10 from August 2021 onwards

To make a module visible to students:

Go into your module.
Click on the administration 'Cogwheel icon', and select 'Edit settings'

3. Look for the "Course visibility" field (fourth item down)

4. Click on the drop down options select 'Show'

5. Click on the 'Save and display' button at the bottom of the page.

This setting determines whether the module appears in the list of modules for students.

To make a module invisible to students (hide it from students)

When the setting Course visibility (see above) is set to Hide, the module is hidden from students, and invisible to all apart from staff with appropriate access rights (such as Editing Teachers).

Greyed out modules

On the module page, if the module is still hidden, the name of the module in the breadcrumb trail will be greyed out.

When you click on the 'Turn editing on' button, in the 'Year End and Archive' block (only visible to editing teachers), the message appears: "Module hidden from students!"

If there are issues with students seeing the module, chances are this is a simple case of the module being hidden from student view. The above process will make it visible.