Notify to iOS need to Understand Log Error

I have this error within my Log file when trying to send a notification to an iPhone.
What am I doing incorrectly? I’m doing this simply by using the Devel Tool to call a service.
Trying to do the simplest thing first.
Thx for any help…

Logger: homeassistant.components.mobile_app.notify
Source: components/mobile_app/notify.py:147
Integration: Mobile App (documentation, issues)
First occurred: 10:36:21 AM (1 occurrences)
Last logged: 10:36:21 AM

Error sending notification to https://us-central1-hassdash-32b34.cloudfunctions.net/sendPushNotification: ContentTypeError(RequestInfo(url=URL(‘https://us-central1-hassdash-32b34.cloudfunctions.net/sendPushNotification’), method=‘POST’, headers=<CIMultiDictProxy(‘Host’: ‘us-central1-hassdash-32b34.cloudfunctions.net’, ‘User-Agent’: ‘HomeAssistant/2023.8.2 aiohttp/3.8.5 Python/3.11’, ‘Accept’: ‘/’, ‘Accept-Encoding’: ‘gzip, deflate’, ‘Content-Length’: ‘399’, ‘Content-Type’: ‘application/json’)>, real_url=URL(‘https://us-central1-hassdash-32b34.cloudfunctions.net/sendPushNotification’)), (), message=‘Attempt to decode JSON with unexpected mimetype: text/html; charset=utf-8’, headers=<CIMultiDictProxy(‘X-Cloud-Trace-Context’: ‘b10977e27f405200bd5e76fef7b2eb41;o=1’, ‘Date’: ‘Sun, 13 Aug 2023 17:36:20 GMT’, ‘Content-Type’: ‘text/html; charset=UTF-8’, ‘Server’: ‘Google Frontend’, ‘Content-Length’: ‘323’, ‘Alt-Svc’: ‘h3=":443"; ma=2592000,h3-29=":443"; ma=2592000’)>)