This is where most failures happen. Angry Birds 2 does support cross-progression via Apple Game Center or Google Play Games. You must use a Rovio Account .
When searching for save data solutions, you may encounter websites offering "Angry Birds 2 modded save files," "infinite gem saves," or data-editing tools. angry birds 2 save data
You logged in, but the game started from Level 1 anyway. You panic and close the app. This is where most failures happen
Go to the in-game settings and log into the exact same account. When searching for save data solutions, you may
Complete the initial tutorial levels, then go back to the "Sign In" tab and log into the same account you used before. Your progress should automatically sync from the cloud. Local vs. Cloud Save Conflicts Occasionally, the game might ask if you want to use a Local Save Cloud Save How can I save my progress? — Angry Birds 2 Help Center
Launch the game and complete the initial tutorial levels (if prompted).