A 401 unauthorized error represents an invalid token. If the TrueLayer token is expired, refreshing it should fix it. Otherwise, the end-user must re-authenticate.
From 1st January 2021, you may see an increase in the error code 401_error_unauthorized with European providers. This would be related to the consent now going through our partner fino, who is regulated to operate in European countries.
This related to Brexit and we have partnered with fino to meet the regulatory requirements when connecting with European providers. You can read more about this here.
Solution
What to do next?
If you need more information
You can read more about our Terms and Conditions in relation to fino here.
For more information on this error message check out the following articles:
What's the difference between "unauthorized" and "access_denied" errors?
You can find all our Data API errors in our documentation here.