Getting Matilda to pronounce "Executor" Properly.

PLEASE HELP!

Matilda is my Go-To  but I am having a heck of a time trying to get her to say "executor" as in the executor of a will.  I have tried SSML 

<speak>
    <phoneme alphabet="ipa" ph="ɛɡˈzɛkjʊtɚ">executor</phoneme>
</speak>  (This is ignored altogether and silence is inserted.)

and 

<speak>
    <emphasis level="strong">exECutor</emphasis>
</speak> (here she says egzecuTOR with an asian accent.)

as well as numerous phonetical spellings but she just ignores them.

interestingly, I tried Aria, Emily, Elli, Jessica, Sarah, Rachel and several others, all pronounce it properly. just Matilda who I am using on a very big project and the client loves her.  

HOW DO I FIX THIS???