Here are all the possibilities, fine the one that suits your situation:
| IOS to IOS | Facebook login available. Old ID and New ID admin transfers. |
| IOS to Android | Facebook login available. Old ID and New ID admin transfers. |
| IOS to Steam | Steam is not cross-platform they need to reach out to support for admin swap. |
| Steam to Steam | Same Steam profile should load progress. |
| Steam to IOS | Steam is not cross-platform they need to reach out to support for admin swap. |
| Steam to Android | Steam is not cross-platform they need to reach out to support for admin swap. |
| Android to Android | Facebook login available. Old ID and New ID admin transfers. |
| Android to IOS | Facebook login available. Old ID and New ID admin transfers. |
| Android to Steam | Steam is not cross-platform they need to reach out to support for admin swap. |