Delta login & download issue

**Describe the bug**
Trying to access this data on Delta: https://bbp.epfl.ch/nexus/web/studios/public/thalamus/studios/e9ceee28-b2c2-4c4d-bff9-d16f43c3eb0f
Cannot add data to cart, and `csv` downloads return empty. Login doesn't work either.

**What part of Nexus is affected**
Delta

**To Reproduce**
Steps to reproduce the behavior, e.g. for Fusion:
1. Go to https://bbp.epfl.ch/nexus/web/studios/public/thalamus/studios/e9ceee28-b2c2-4c4d-bff9-d16f43c3eb0f
2. Select a file to download and add to cart
3. Click on cart. It doesn't open.
4. Try to download CSV instead. click "Download CSV". Downloaded CSV is empty.

**Expected behavior**
- You can add the files to the cart and download them compressed
OR
- You can download the files as CSV and the fields are populated.

**Screenshots**
Screen recording included via [this OneDrive link](https://1drv.ms/v/s!AuYCQWO6dsE2jdtcw43RVJjWk_1pCg?e=FsRpxN)

**Additional information**
My IP is in Canada. I don't know if that has anything to do with anything, but thought it might be useful.

Start by reproducing the issue at the Delta studio URL, checking login, adding a file to the cart, opening the cart, and using “Download CSV.” Trace the affected Delta entry points for these flows; done means authenticated access works, files can be added and downloaded, and the CSV contains populated fields.

Written by the indexing model from the issue text.