Separate the three questions
Cross-play asks whether people on different systems can play together. Cross-progression asks whether one person's progress can follow them between supported systems. Cross-purchase asks whether buying something on one platform grants access elsewhere. These features can exist independently. A game advertising one should not be assumed to provide all three.
Read the publisher's current account-linking and progression documentation for the exact game. Rocket League's official FAQ, for example, distinguishes linked progression from the ownership and location of items. Such details are game-specific. Do not generalize a successful link in one title to every game using the same publisher account.
Identify the accounts before linking
List the platform accounts you already use and the publisher account associated with each. A console may have created or linked an account during an earlier setup, so do not begin by making another one automatically. Use the official account-management page to establish the existing relationships. Keep sign-in details private and use the supported recovery process if you cannot access an account.
Check whether the service asks you to choose a primary progression source or imposes restrictions on changing links. Read those consequences before confirming. Linking is not always an unrestricted merge of two separate histories. If both platforms already contain valuable progress, find out which data will remain available and whether the process can be reversed.
Do not share one person's account among several household players merely to make their progress look unified. It can confuse saves, purchases and security, and may conflict with the service's rules. Each person's progression should use the supported account arrangement intended for them. Household game sharing and cross-progression are different features.
Check what does and does not travel
Look separately at campaign saves, levels, competitive rankings, achievements, cosmetic items, paid currency and downloadable content. The publisher may handle each category differently. A cosmetic item appearing on another device does not prove that an expansion license or currency balance moves too. Read the exceptions that matter to your intended switch rather than only the headline benefit.
Consider the base-game license on the destination platform. Even if progression is available there, you may still need a valid way to access the game. A subscription, trial or purchase can have its own conditions. Confirm the exact edition too, since a remaster or separate release may not use the same progression system.
Paid currency deserves especially careful reading because a shared item inventory does not necessarily imply a shared currency balance. Before buying currency on a second platform, check where it can be spent and whether the resulting items are available elsewhere. Keep receipts associated with the account and platform that made the purchase. If the documentation does not answer the intended use, ask the publisher before paying rather than using a purchase as a compatibility experiment.
Verify with a small controlled session
After following the official linking procedure, launch the destination version and inspect recognizable progress before making major changes. Check the character, level or inventory that the documentation says should transfer. If the result is unexpected, stop and consult support rather than unlinking and relinking repeatedly. Those actions can have restrictions and may make the history harder to interpret.
Keep a private record of the confirmed account links and the official instructions used. When selling a device or changing platforms later, review the publisher's removal and linking rules before resetting anything. A successful cross-progression setup is one you understand well enough to maintain, including its exclusions, rather than a promise that every digital purchase now belongs everywhere.
