Data Integration from ERP throwing 401 error

We have a pipeline that runs every morning around 2:30 am to refresh the last 4 years of budget data, the current and 3 previous years. The pipeline uses the same integration with 4 different sets of parameter values to correspond to the start and end dates of the fiscal years, respectively, after first clearing the data from EPM.

This integration has run fine for several months; however, starting December 5th, it has failed each time when it reaches each previous year. The current year processes fine.

Moreover, I can run the pipeline manually, and everything works as expected.

The only error in the logs appears to be truncated: