Hello @brad overton ,
By design, SharePoint Alert Delivery Method only supports Emails and SMS.
Here is Microsoft official article:
In the Delivery Method section, select the method of delivery you want for your alerts.
Note: To send an alert as a text message, you need to enter your phone number in the box. If the Text Message (SMS) options are grayed out, the site might not be configured for outgoing e-mail and SMS alerts. Contact your Microsoft 365 or SharePoint Admin.
Thanks,
Echo Du
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