Hey there @vizibal, thanks for taking the time to get in touch. I am sorry to hear that you have received the DELTA-0000D013 error code, I will gladly investigate this further for you. It sounds like this error code might be connectivity related. I have just looked into it from my end, and I can confirm that as of 10:52 am BST on the 21st of April, that all of our Rainbow Six Extraction servers and services are running as intended. Therefore I would recommend you run through our connectivity troubleshooting in this article and ensure you have completed all the steps. These steps can help rule out many of the common causes for connectivity-related issues. I understand you have already performed several actions to try and remedy the issue such as verifying your game files, but we must cover everything in the article first.
Once you have completed those steps, and if you continue to experience the error, could you please provide some screenshots displaying the code? You could directly upload the images here on the discussions or you could try sending it to us another way, such as through a file-sharing site.
Should you have further questions regarding any of those steps in the article above, or regarding any other issue, please do not hesitate to let me know.