Sodapop My carrier says its a know bug on all pixel 9 and 9A
If your carrier claims that Pixel 9 and 9a devices reject their eSIMs with "The sim is being used on other service, to fix issue, contact your operator", that sounds unlikely, but it could be true. However, this description does not match any description I have seen of eSIM issues with 9-series and 10-series devices.
Obviously I don't know everything! So if this is a "known bug" in the sense that people other than this carrier know about it, perhaps the carrier can share links to public posts about this problem affecting eSIMs. If the carrier is aware that it is a "known bug" with their eSIMs and not anybody else's, I doubt anybody on this forum can help with that.