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There could be several reasons why the method call in Ruby on Rails never occurs, including:

1. Improper syntax: Check if the method call is written correctly in the Ruby on Rails code. There could be a syntax error that is preventing the method from being executed.

2. Wrong method name: Ensure that the method name is correct and matches the one in the Ruby on Rails code. Typos or misspellings can cause the method not to be called.

3. Incorrect object or variable: Verify that the object or variable being used in the method call is defined and initialized correctly. If it is not, the method call will fail.

4. Method is not being called: Check if the method is being called at all. There could be a logical error in the code that is preventing the method from being accessed.

5. Controller action is not being triggered: If the method is part of a controller action, ensure that the action is being triggered appropriately. This could be due to routing or view errors.

6. Server issue: Check if there is any issue with the server or environment where the Ruby on Rails app is running. This could be causing the method call to fail.

7. Debugging: Try debugging the code by using debuggers like Pry or binding.pry to understand what's happening underneath the app.

Examine each of these potential factors to pinpoint the reason why the method call is not occurring.