Speak punctuation.
Say period or full stop, comma, colon, semicolon, question mark or exclamation mark.
Quoted punctuation words and phrases about punctuation are guarded so they can stay as words.
A punctuation instruction may occasionally appear as words, especially after a number or amount. Correct the delivered text or its Activity item; that edit does not change future dictations.
Formatting can add a missing terminal mark but cannot replace one already supplied by recognition. If a question ends with a full stop, change it yourself.