Custom Post Type Metadata Not Saving

The primary issue is your save_post action isn’t firing because:

add_action( 'save_post'. 'save_meta', 10, 2 );

should be

add_action( 'save_post', 'save_meta', 10, 2 );

You also have inconsistency between client-name and _client_name, but without seeing the field_value function, I’m not sure if that’s a problem or not.

I would also use something more unique than save_meta and add_meta_boxes for function names, potential for collision with some other code is high.

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