I am trying to create a monk subclass that does magic.  I can't seem to get the monk class to recognize that I have added spell capabilities in the subclass.  Is there something I am missing?   Can it be done?  I tried looking at the Thief arcane trickster to see how hat is set up, I didn't see anything different from what I have done.

You have to add a subclass feature called “spellcasting” or it won’t work. The description could be gobbledegook, as long as the name of the feature is “spellcasting” it’ll give them the exact same spellcasting table that the Arcane Trickster and Eldritch Knight get.

I had Spell casting.  added a space.  Thank you Iamsposta.

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