Hello,
Based on our experience, every time this issue has occurred, it’s been related to Zscaler interfering with the request. Specifically, the required ‘DevOps-Platform-Access-Token’ header gets removed, often due to firewall or security settings within your company’s network.
Reference: Unable to Create new organization in sonarcloud failed with a linkedIn in error - #19 by chrislain
As a workaround, you could try performing this action outside of your company network (for example, from a personal device or non-corporate internet connection). You should then be able to create the organization without this header issue.