Minecraft Launcher shows that I can only play DEMO, but I've already bought the game

I've bought the game 5 years ago, and already migrated from Mojang account to Microsoft account, but when I downloaded the latest launcher this week, It shows that I can only play Demo. I'm sure I've already logged in with the same Microsoft account on Microsoft store and Xbox, But no matter how many times I restart the launcher, log in and out, re-download, it always shows "we couldn't connect to the Minecraft services." Please help me, thanks.