Not Picking Up Shortcode

I’m hoping to get this working…

I changed all the PHP 5 db directives to PHP 7, and got it to activate!

But there must be some kind of mismatch, as the shortcode is just sitting there on a page, and the plugin is not picking it up:

[tablemaster table=”tm_example_table”] <=== TABLE NAME DOESN’T MATTER

This is in text, and not visual, editor.

I’ve not written a shortcode from scratch yet, so don’t know where to look…

Thanks!