I cannot get dji go4 app to run on my tablet (Huawei 8" with andriod version 7.0)
the app loads but will not let me sign in. The verification code will not enter.

Sign in to what?
I have the same tablet (Huawei 8, Android 7), and Go4 installs and runs perfect and stable. No verification code needed.

I also have the Huawei MediaPad M3 8, been using it for 3 years with no problems whatsoever,

Hi there. Thank you for reaching out and we're sorry for the trouble. Can you please send us a screenshot showing the error message? Can you please try to sync your flight records and reinstall the app then check if the issue persists? Please keep us posted. Thank you.