@Sflboxter - I was having the same frustration but was finally able to figure it out (it is a little buried). Settings > General Management > Language and input > On-screen keyboard > Manage Keyboard Turn off "Samsung Voice Input" Make sure "Google voice typing" is enabled Voila! The microphone in my texting and email apps now pulls up the Google Voice Typing with the gray underlined words for me to pick alternative word options as I was used to on my Galaxy S7. Hope that solves it for you too!
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