Outreach Source failing while loading the mailing data -Bad Gateway

Hello Team,

While loading data to the Redshift from Outreach. Job is failing due to below error.

Request URL: https://api.outreach.io/api/v2/mailings?page%5Bsize%5D=1000&count=false&sort=updatedAt , Response Code: 502, Response Text: <html>
The run is fullrefresh-overwrite .