If you have already linked your tracker to an INGO account before, try doing the following from the previous account you had INGO linked to:
Go to Fitbit App > Account > Third Party Apps > Manage 3rd Party Apps and revoke access to Health Hub (INGO'S health engine responsible for tracking your progress and rewarding you with points).
Now try selecting Fitbit again from INGO app > Profile > Settings > Health Tracker.
Go to Garmin App > Settings > Connected Apps > tap on Health Hub in the list > Disconnect.
Now try selecting Garmin again from INGO app > Profile > Settings > Health Tracker.
Go to Huawei Health App > Me > Privacy management > Data sharing and authorization > tap on INGO > deselect all > OK.
Go to Huawei Health App > tap on Profile Picture > Privacy Center > Control Account Access > Tap on INGO > tap Cancel Authorization and confirm cancelling.
Go to Google Fit App > Profile > Settings > Manage connected apps > tap on INGO > Remove access > OK.
Now try selecting Google Fit again from INGO app > Profile > Settings > Health Tracker > This mobile > Pair with Google Fit.