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Need Help, GTN states invalid key

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So, recently purchased my GTN 750. Installed and it is stating I have a invalid code. I looked first on the forum and followed the steps people stated earlier about removing Garmin Trainer and all files for Reality XP, then re-installed it and its still not working. 

I am running the current Windows and my computer is up to date, I am also using Xplane 11.

Any help would be greatly appreciated for troubleshooting!


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Can you please tell what is the exact error message, is this just "invalid code"?

Is this displayed in a popup window?

on the GTN screen?

Have you moved the add-on between computers?

When 'recently' was this?

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