Cooker printer to HP app on new wifi network

[Jane_wellington]

I have a new Wifi network and can’t add the existing printer to my HP app. The install finds the printer IP address and stalls after that. Error message UA_400_xxxxx received after one of many attempts

[Hawks_Eye]

Hi @Jane_wellington 

Welcome to the HP Support Community! We're here to help you get back up and running.

Thank you for sharing the details. I understand that the printer is detected by IP address but the installation does not proceed, and you’ve seen the UA_400_xxxxx error during attempts. I appreciate you letting me know this, as it helps narrow down the situation.

To better understand the issue and guide you with the right HP‑aligned steps, could you share:

The exact printer model you are working with

Whether the printer has already been connected to this new Wi‑Fi network through its control panel or Embedded Web Server

If any troubleshooting steps have already been tried, such as reinstalling the HP App or checking firmware updates

This information will help me provide precise guidance tailored to your product.

We're looking forward to helping you get back up and running! 

Regards, 

Hawks_Eye

Note: Do not share any of your personal information in public, such as serial number, phone number, email ID, etc.

[Jane_wellington]

Thanks for getting back. (Subject line should say "Connect" printer, amusing typo!)

The problem has resolved itself - don't know why it works today when it didn't yesterday but I'll take it! BUT there is an anomaly on the HP app - I cannot add the printer to the app. When I select "Add Device" the error message shows: "No available printers found, Check with your admin for assistance." Also the printer does not show up on my HP account on Admin.HPSmart. 

Does that matter? Because I *can* find it at the level of files I want to print, both on my phone and on my laptop.  And the scan function works now, too. I'm able to print and send scanned files.  And I can now use all the functions on my printer.  If I don't need to worry about the printer not showing on my HP profile/account, we'll call it a day.

Before I thought to verify if the problem had persisted, I wrote up this answer - so if you want to check out the HP app anomaly here it is... thanks a lot for getting back, 

The printer is an HP LaserJet M139we

The printer was briefly connected, apparently, as I can see it on my WiFi provider's web portal on the lost of IoT devices. But it has never shown on that site as "connected". My provider can't explain how that could have happened. 

I attempted to add the printer to the WiFi on the 2.4 Ghz "IoT Onboarding Mode". In that mode I used all of the troubleshooting steps detailed below. 

The printer does not have a control panel - unless you count the tiny window that displays alphanumeric 2-digit chraracters

The HP app does not provide the features that the HP help site tells me I should find on it. So for example, there is no place to access the EWS

I have not checked firmware updates - don't know how to do that for the printer, and for the laptop, it is a brand new MacBook Air with latest iOS, Tahoe 26.5.1

Troubleshooting included:

delete and re-load HP app

sign onto app variously with account and as guest

unplugged and plugged back in modem, computer, printer 

attempted to set up printer with IP address (as opposed to letting set-up find the IP address)

attempted to set up the printer as a new printer, and as an existing printer: using new printer got me the farthest, and that's the path where it stalled after acquiring the IP address. Existing printer didn't go beyond printer not found

[Hawks_Eye · Accepted solution]

You are welcome @Jane_wellington 

Thank you for confirming the details and sharing the follow‑up. It’s good to hear that the printer is now functioning for both print and scan, even though the HP App anomaly remains.

Here’s why this situation can occur: The HP App is designed to show devices linked to your HP account, but in some cases the printer may still work correctly without appearing in the account or Admin.HPSmart portal. 

This can happen if the printer was set up in guest mode, if the account link did not complete during installation, or if the app is relying on local network discovery rather than cloud registration. 

In such cases, printing and scanning continue to work normally, but the printer does not display under your account profile.

Since you are able to print and scan from both your phone and laptop, and the printer responds as expected, the absence of the printer in your HP account does not affect functionality. It only limits account‑based features such as remote management or viewing the printer under your HP profile.

If you would like to ensure the printer is fully registered to your account, you can try:

Signing out of the HP App and signing back in with your HP account credentials.

Using the “Add Printer” option again while signed in, ensuring the printer is on the same Wi‑Fi network.

Checking for firmware updates through the HP App (open the printer tile → Settings → Advanced → Firmware Update).

Reference: Update the firmware on an HP printer | HP® Support

If everything is working and you don’t need account‑linked features, you can continue using the printer as it is. 

Regards,

Hawks_Eye

[Jane_wellington]

Super helpful Hawks_Eye. Many thanks!!

[Hawks_Eye]

You are welcome @Jane_wellington 

Glad to hear this. A huge thank you for marking this post as the 'Accepted Solution'! We're thrilled that we could help resolve your issue. 

If you have any more questions or need further assistance, please don't hesitate to ask. We're here to help! 

Thanks again for your confirmation, and we wish you an amazing day ahead! 😊

Regards, 

Hawks_Eye