A warm welcome to the Community @mike_67. Thanks for sharing the phone you're using.
I was checking the list of supported devices and I couldn't find the Xiaomi Mi 9T and this can be why you're not receiving notifications. However, our team is always testing new devices and adding them to the list. In the meantime, you can try this troubleshoot to see if you get them working.
Regarding your question about connecting your Ionic to the Mi True wireless earphones, please try the steps in this article: How do I connect Bluetooth audio devices to my Fitbit watch?
Let me know how it goes. I'll be around if you need further assistance.
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