Hi there! I understand you're having trouble executing buy or sell orders on the Trade Republic app. Let's try to get to the bottom of this together.

Could you tell me a bit more about what's happening when you try to place an order? For example:
- Are you seeing any error messages?
- Are you placing market, limit, or stop orders?
- Does this happen on both buy and sell transactions, or just one type?
- Are you using the mobile app or the web version?
- Have you recently checked your account balance or holdings to ensure there's enough to perform the trade?

Once I have a bit more context, I can guide you step-by-step on how to resolve this.

Meanwhile, here are some common reasons orders may not execute on Trade Republic and what you can do:

1. Market Order Availability: Sometimes, if you're placing a market order, there might not be enough available units of the security to fulfill the trade at that moment.

2. Order Type and Limits: If you're using limit or stop orders, the order may not execute immediately unless the price reaches your specified level.

3. Technical Issues: Sometimes an app glitch or connectivity problem might interfere with order execution. Restarting the app or device, or checking your internet connection can help.

4. Account Issues: Ensure your account is fully verified and has sufficient funds or holdings for the transaction.

To start, try these steps:
- Restart the app and log in again.
- Check your balance and holdings.
- Try placing a simple market order to see if it executes.
- If using web, see if switching to the app helps or vice versa.
- Make sure your app is updated to the latest version.

If these don't help, let me know the details you observe, and we can troubleshoot further or consider other approaches.

Are you able to share any specific error messages or behaviors you’ve noticed? This will really help me assist you better.