Trying to write shortcode with get_post_meta but isn’t working

There are several minor problems with your code:

Firstly, you are using shorthand PHP tags, like <?= /*some stuff*/ ?> they won’t work – see WordPress Coding Standards – No Shorthand PHP Tags.

Secondly, you are not echo‘ing the variable $client_name.

Last but not least, you are saving your post meta with the name _client_name, with an additional underscore at the front, but made a typo while trying to get it, the underscore is missing.

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