http request -> Cloudflare security issue

I am a beginner in n8n and I am setting up a workflow for our finance team that is intended to download invoice attachments such as PDF and CSV files from our supplier's portal. The flow runs until the most important node, namely the login procedure, is executed, at which point I keep getting a 401 error or a message from Cloudflare security. Does anyone have experience with this? I've been struggling with this for two days now.

Any information that helps me move forward would be greatly appreciated.

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