Hi! I see you're experiencing a 404 HTTP error with the Proscenic app, and your vacuum isn’t showing up in the app. I’d be happy to help get this sorted out.

To start, can you tell me a bit about your setup?
- Is your vacuum connected to your Wi-Fi normally?
- Have you recently updated the Proscenic app or your vacuum’s firmware?
- Are you using the latest version of the Proscenic app?
- Have you tried restarting your vacuum, phone, or router yet?

Meanwhile, here’s a straightforward troubleshooting path for this issue:

1. Restart Your Devices:
Power off your vacuum, your Wi-Fi router, and your phone (or the device running the app). Wait for about 30 seconds, then power them back on. This can refresh the network connections and clear temporary glitches.

2. Check Wi-Fi Connection:
Make sure your vacuum is connected to your home Wi-Fi network. The vacuum won’t show up in the app if it's disconnected or connected to a different network.

3. Update the App and Firmware:
- Go to your Windows device or phone app store and confirm you have the latest version of the Proscenic app installed.
- If possible, check for any firmware updates for your vacuum through the app or Proscenic’s website.

4. Re-login to the App:
Sometimes, your session may expire or run into syncing issues. Log out from the app, close it completely, then log back in.

5. Check for App or Server Issues:
Occasionally, Proscenic’s servers might be down or having issues, causing “404 Not Found” errors. If you suspect this, wait a bit and try again later.

If after these steps the issue persists, we can look into more advanced settings such as resetting network configurations on the vacuum or reinstalling the app.

Could you try these first and let me know what happens? Also, please share if you see any other error messages or unusual behavior in the app.