Hello there, sorry to hear you're having trouble launching EA FC 26.
Since you purchased the game through Steam and are receiving an Invalid License error, this can happen if you're signed into a different EA Account from the one linked to your Steam account.
You can double-check which EA Account is linked to your Steam account by checking your Connections page here: EA Account Connections
If the correct EA Account is linked and you're signed into that account in the EA app, please try clearing the EA app cache:
- Open the EA app.
- Select the menu icon (☰) in the top-left corner.
- Go to Help > App Recovery.
- Select Clear Cache.
- Once the EA app restarts, try launching FC 26 through Steam again.
You can also find the full steps here: Clear cache to fix problems with your EA app
Let us know if that helps or if you're still running into the same error.