Sims 4 DLC's not downloading on EA

@Rosieflower2207  Just to confirm, you've tried signing into an EA site with your Steam credentials, and it works, you land in the correct EA account?  This is important because it could explain the issue all by itself.

If that's not the problem, please do a clean uninstall of both Sims 4 and the EA App, then reinstall both, using Steam to install Sims 4.

• Put aside your Sims 4 folder in Documents\Electronic Arts <strong>and</strong> rename it to something that doesn't include the words "Sims 4."
• Download Revo Uninstaller (the free version is fine) from here.
• Launch Revo, select Sims 4 from the list, and click Uninstall.
• Cancel the system restore point; you don't need it.
• Once the game is uninstalled, select "Moderate" under "scanning modes," and click Scan.
• Review the list, in case there's something you want to save; otherwise, click Select All, and then Delete.
• Close Revo, and restart your computer.

For the EA App:

• Launch Revo, select the App, and click Uninstall.
• Cancel the system restore point.
• The EA App may open a window.  Click Uninstall, then in the Revo window, click Moderate under Scanning modes, and click Scan.
• Revo will present a list of registry entries.  Click Select All, then Delete: you don't need or want to preserve these entries.
• For the leftover files and folders, click Select All, review the list and deselect anything you'd like to keep (this is unlikely, but it's worth checking), click Delete, and you're done.
• Close Revo, and restart your computer.

Install the EA App, then Sims 4 and any packs you own through Steam.  Don't install anything you own in the EA App until you've tested the game once.