"403 ERROR The request could not be satisfied." request when accessing some websites with Safari

Hello guys

for some websites I want to open with Safari, I do get the following blocked request:

"403 ERROR

The request could not be satisfied.

Request blocked. We can't connect to the server for this app or website at this time. There might be too much traffic or a configuration error. Try again later, or contact the app or website owner. 

If you provide content to customers through CloudFront, you can find steps to troubleshoot and help prevent this error by reviewing the CloudFront documentation. 

Generated by cloudfront (CloudFront)
Request ID: i9MzIUCeA9EK9cri44lzTkvTz1iT8QOA0rX6K8LMG8la5IdsQ3Gmog==

"

I already installed Malwarebytes but nothing was found. I also followed this step by step instruction but did not work ( https://macpaw.com/how-to/remove-cloudfrontnet-adware )

It is highly annoying and I would be really happy about any help.

Best

Mark

[Re-Titled by Moderator]