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:

Fitbit

Go to Fitbit App > Account > Third Party Apps > Manage 3rd Party Apps and revoke access to INGO Health.

Now try selecting Fitbit again from INGO app > Profile > Settings > Health Tracker.

Garmin

Go to Garmin App > Settings > Connected Apps > tap on INGO Health in the list > Disconnect.

Now try selecting Garmin again from INGO app > Profile > Settings > Health Tracker.

Huawei

Go to Huawei Health App > Me > Privacy management > Data sharing and authorization > tap on Ingo Health > deselect all > OK.

Go to Huawei Health App > tap on Profile Picture > Privacy Center > Control Account Access > Tap on Ingo health > tap Cancel Authorization and confirm cancelling.