Updating Authorized Endpoints

1. Open IIS. 
2. Expand the BoldBIonpremise site
3. Right click on the /rubex sub application as below and click on the explore

4. It will explore the files for this subapplication.
5. From the explored folder, Navigate to the below location,

\App_Data\default\

6. Now, you can find the "embedDetails.json" file
7. You can edit the file and change the "EFileCabinetUrl" node value as *.efilecabinet.net to accept all the sub domains.

Note: If you change it from *.efilecabinet.net to just * then it'll considering any requesting endpoint as valid.