Can I transfer Sims 4 from Xbox one to windows pc via EA app?

No. They are considered 2 different platforms so the Xbox version will only work on the Xbox.

it is not available via microsoft on pc and has to be bought from EA or Epic or Steam, the sims 4 is free but the dlc is not and that cannot be transferred like most nearly all games. only a select few titles are play anywhere and they are very limited.

Hi, Jadon! Thank you for reaching out.
I'm AJ, an Independent Advisor for the Xbox Community.

Unfortunately, expansion packs for The Sims 4 are not available on the Microsoft Store or the Xbox App for PC. If you are playing this game on the Xbox App via EA Play, you'll need to purchase the expansion packs from EA instead.

Best regards.

Hi, the PC version of the Sims 4 is not available on the Microsoft store for Windows 10. To get the game for PC, you have to purchase it from EA using there origin app, which you can download from here https://www.origin.com/gbr/en-us/store/download And
yes you will have to purchase the game and add-ons again for the PC.

Hi,

There's some confusion here. Have you bought the Sims 4 for console or have you purchased it for use on your PC?

If you've bought it on the Microsoft Store with the intention of playing on PC you can't. Microsoft does not sell The Sims 4 for PC. You'll need a refund. If you want it for PC you need to buy it either via Steam (EA games are now sold there) or directly
from EA via the PC origin Store.