OdataLink Error Code 9001: Xero denied access to the endpoint or data file
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Error 9001 will be logged when Xero denies access to the endpoint or data file.
This can occur if you add new types of models (e.g. Xero Accounting Models vs Xero Projects Models).
Permissions are established when you first add your data file. You can reauthorise access to your data file to refresh the access and permissions.
It is also possible that you are trying to pull data from a models that you do not have available in Xero itself. For instance, you will never be able to pull data from Xero Projects Models unless you actually have that functionality activated in Xero.
As a last resort, you may also remove and re-add the data file.