Hi there! I understand you're encountering an error message stating “device not authorized: please contact merchant to register” when trying to print. Let's work through this step by step to resolve it.

First, I’d like to gather a bit more information:
1. What type of device are you trying to print from (e.g., a computer, tablet, or smartphone)?
2. Are you using any specific software or application to manage your printing?
3. Have you tried restarting your device or reconnecting to the printer?

Your answers will help me guide you better!

Tried both of my iphone (SE2020 and 6S) and my ipad air 3 with the walkprint app, yes restarted all devices, and deleted and redownloaded walkprint app and still having issue

Thanks for the details! Since you've already restarted and reinstalled the WalkPrint app but are still seeing that device authorization error, let's dig a bit deeper.

Here are a few steps to try:

1. Verify Printer Connectivity: Ensure that your printer is properly set up and connected to the same Wi-Fi network as your iPhones and iPad. Sometimes, the internet connection may cause issues with authorization.

2. Check for App Updates: Make sure that the WalkPrint app is updated to the latest version. Sometimes, having an outdated app can lead to functionality issues. You can do this by going to the App Store, tapping on your profile picture, and scrolling down to see available updates.

3. Printer Registration: The error message suggests there may be a registration issue with the printer. If you have a separate account or have set up a merchant account within WalkPrint, please check if your printer is linked to that account. You might need to re-register the printer.

4. Reset Network Settings: If the above steps don’t work, consider resetting the network settings on your iPhones and iPad. This may resolve connectivity issues:
- Go to Settings > General > Reset > Reset Network Settings. (Note that this will erase saved Wi-Fi passwords.)
- Reconnect to your Wi-Fi afterward.

5. Re-add Your Printer: Within the WalkPrint app, go into the settings and remove the printer from your list if it's there. Then, try to re-add it by selecting "Add Printer" or similar option.

If you're still facing issues after trying these steps, I recommend reaching out to WalkPrint support directly at [email protected], as they can assist with registration issues on their end.

Are you satisfied with the solution I provided or would you like more assistance?