Apple recently published documentation that explains the private relay feature in more detail.
The documentation included a link to a .csv document that contains all of the egress IP ranges that the service uses: https://mask-api.icloud.com/egress-ip-ranges.csv
Most of these resolve to either Akamai or Cloudflare which might(?) be blocked from tracking when using the "Block tracking requests from Cloud"
Apple recently published documentation that explains the private relay feature in more detail.
The documentation included a link to a .csv document that contains all of the egress IP ranges that the service uses: https://mask-api.icloud.com/egress-ip-ranges.csv
Most of these resolve to either Akamai or Cloudflare which might(?) be blocked from tracking when using the "Block tracking requests from Cloud"