Toolchain Manager failed to download toolchain index file

When using the Toolchain Manager through the nRF Connect for Desktop app, the Toolchain Manager is failing to fetch the index files resulting in the version 2 toolchains being unavailable.

I also receive an error when trying to run the search option using the Toolchain Manager from the command line:

$ ~/.nrfconnect-apps/node_modules/pc-nrfconnect-toolchain-manager/resources/nrfutil-toolchain-manager/darwin/nrfutil-toolchain-manager.exe search


Error: Failed to download toolchain index

Caused by:
Failed to download from developer.nordicsemi.com/.../index-macos-x86_64.json (403 Forbidden)

Accessing the index (developer.nordicsemi.com/.../index-macos-x86_64.json) from a web browser works fine so I am not sure why the app gives a 403 response.

I have also tried downloading the file using wget and that failed with a 403 response too.

This Q&A in the link below seems to discuss a similar issue although it seems to be caused by a proxy issue; however, I do not have any proxies set up and have tried this through multiple network connections receiving the same 403 every time.

devzone.nordicsemi.com/.../373729

Any ideas as to what could be causing the problem and how to go about fixing it? 

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