Cannot enter some websites from workplace

Hello,

I am representing a DataCenter in Turkey, Our Network is unable to visit the following websites;

https://getir.com https://www.beinconnect.com.tr https://www.a101.com.tr

It immediately rejects by saying;

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: ZRvV_cBL-UqBp5WBjZqaz1aHJYVDl5UDOlIBRSoIMEdgOlK7ICSp2Q==

Our ASN is AS43391.

These websites are used for online shopping, sports viewing and such. We are pretty strict when it comes to Abuse and wish to fix this situation to enable the connectivity again.

How should we proceed?

Kind Regards