There are many reasons this could happen:
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The Reuse Authentication Feature allows you to use the same credentials as you are using with another task in FitnessSyncer. You should use this when you have more than one source or task using the same service which you wish to use the same account. For example, if you are using Withings for your Body Composition and Activities, you could use this feature to share the credentials. Some services (including Withings and Fitbit) may provide authentication errors if you do not use this feature.
To do this, pick one of your sources or destinations and re-authenticate it. For each of the other sources and destinations using the same authentication scheme, you should edit them and change the authentication to Re-use Authentication from that first source or destination.
The issue is caused by a security feature from Google. To workaround this, try this:
From TomTom MySports,
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Each Google Services requires separate authentication. Because we support multiple services that use Google Services, we only request the minimum by default. If you use more than one Google-based Service, please use the “Grant New Permissions for All Google Services” option to ensure you have the permissions for all and re-use that authentication for all of the other services.