My customized personal greeting is not playing when I am not able to answer a Zoom phone call.

hi ggunwall,

Add Audio for your custom vm greeting.  You can use text to speech, upload a recording  or record by computer. 

Give your greeting an Asset Name, assign a category – Voicemail greeting, and click Add to save your greeting.

Click Edit and Choose from Asset Library to replace the default greeting with your custom greeting.

Select an audio – Voicemail greeting

Once you have selected your voicemail greeting, it will be active.  You can test by playing your audio.

 for additional details, please see zoom support article.

Customizing audio greetings and hold music (zoom.com)

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thanks,  eliot