Ok if you can't get to a live agent at that number above anymore, then use the main Microsoft phone# and get an live agent. There is no reason you should have to replace your product- if they changed or discontinued their products/reg.
The Main Microsoft phone # for USA is- 1-800-642-7676 - and talk to "Technical Support" and get someone LIVE!
(
https://support.microsoft.com/en-ca/help/4051701/global-customer-service-phone-numbers)
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Now if you want to go to P3D regardless, (not sure if you can even get P3Dv3x anymore.. - it's P3Dv4.5 which is the current version).
(But if you go there, it's a much better sim than anything else you have used before (and basically has the same folder structure as old' FSX but run's at 64bit.. so if you're running a windows 7, 8 or 10 OS in 64bit then P3Dv4.5. academic works - and very well.
BUT.. the only thing with P3Dv4.5 that you have to be aware of is that only FSX native models and up work, so any older FS9 files (which existed in FS9, FSX or FSX-SE don't work in P3Dv4.5 and actually crash the sim: that why there is the Tongass fixes here - make it work in P3Dv4x as well as a couple of RTMM models upgraded to FSX Native...
See LINKS:
https://return.mistymoorings.com/getting_started/index.php#5https://return.mistymoorings.com/getting_started/index.php#9Let us know how you make out with Microsoft! (I just talked to them last week concerning a corrupt v1909 update in Windows 10 - so I know they are somewhat ALIVE (even though they might not be very smart at times!(that's a long story for another day!).