Starting MSFS2020 after installing new CPU and MoBo question about my account?

Changing MoBo and CPU went well. Win10 started without any problems and everything is as before. But when starting the msfs it asked my something about my account. Do i have to reinstall the whole sim?

It says MSFS is not available in my account. And i am logged in my Store. Error code: 0x803f8001

And its also in my library at MS Store.

Not sure if solved my problem, but i realized that my system time was completely wrong. Now after correcting it msfs starts.

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