All links on Twitter for Discord go to App Store

Hi TwitterDiscord,

If you're not seeing an issue with link routing for other apps, you'll want to contact the developer of the app. How to contact an app developer

"When to contact an app developer for help

• If an app isn't working, but the issue doesn't affect other apps.
• If you can't use an in-app purchase, such as a bonus game level or "remove ads." 

Contact the developer of an iOS, iPadOS, or watchOS app

1. Open the App Store on your iPhone, iPad, or iPod touch.
2. Search for the app, then tap it. If you can't find it, tap the account button  or your photo at the top of the screen, tap Purchased, tap "Not on this [device]," then tap the app.
3. The app's product page appears. Scroll to the Ratings & Reviews section, then tap App Support. If you don't see App Support, make sure that you're signed in with the correct Apple ID."

You can find contact information for this particular app developer here: Discord

Cheers!