How to re-activate MSFS2020?

Hello Art, this is Manuela. I'm an Independent Advisor and community user like you, ready to assist with this.
Not a Microsoft employee.

I would like to let you know that the code you redeem for the Microsoft Flight Simulator license is linked permanently to the Microsoft account used for this purpose.

Unfortunately, once redeemed a code, it is not possible to transfer the license or redeem it again.

You can review this information and more by visiting the next article:
https://support.xbox.com/help/subscriptions-bil...

Have you tried running a repair on it though as opposed to the reinstall? Certainly agree that Gaming Services is the fulcrum here as it does seem to be a dependency. Perhaps worth trying to get that re-installed independent of MSFS2020 first before attempting to reinstall MSFS2020?

I don't understand. Save data for MSFS2020? How i delete this save data or change? My Windows is new clean instalation, and the MSFS2020 too.

I certainly did.

Repair/Reset...even terminate and re-installed the X-Box app. I even tried re-installing Windows 10 (much quicker than MSFS2020) as well as a system restore - all fruitless.

Re-installing MSFS 2020 (3+ hours) looked like an eventual option but was not advised by MS Tech support over the phone as the issue (according to them) was an imminent Windows update in conjunction with a MSFS2020 update that they are working on.

I found the problem thanks to Bernie on the Prosim737 forum. The issue arises when you don't install MSFS2020 on the same drive as Windows in the default location. I'm going to try a couple of work arounds that were suggested but if they don't work I will have to re-install MSFS2020 in the default location.

Jerry