Android 11 phone to printer. No printing; Message is: Printer blocked, unknown certificate

[Ristenk]

Recently the phone can no longer send to printer. The message on the Android 11 is: printer blocked, unknown certificate. I tried clearing the phone's HP app printer cash but not successful in getting it to work. Phone shows printer online and tries to print before getting printer blocked, unknown certificate message. I logged into the HP app... It suggested updating certificate, which I did, but still it does not work after trying again.

[sandytechy20 · Accepted solution]

@Ristenk

Welcome to the HP support community.

Install the HP Print Service Plugin

1. Confirm your Android device is connected to the same network as your printer, or that Wi-Fi Direct on your printer and Android device is enabled.

2. On your Android device, install or update the HP Print Service Plugin (in English).

3. Once the installation or update is complete, choose your Android device to turn on the plugin:

   • Android 7 (Nougat) and later devices: The HP Print Service Plugin turns on automatically after installation. Continue with these steps.

4. Turn off any other print service plugins, if necessary.

You can refer this HP document for more assistance:- Click here

I hope that helps.

To thank me for my efforts to help you, please mark my post as an accepted solution so that it benefits several others.

Cheers.

[Ristenk]

That worked opening the pdf through the HP Smart. It still doesn't work to just open the pdf and hit print but if I just have to open it through the HP smart app to get it to work then that is good. Thank you!

[sandytechy20]

@Ristenk

Good to know that issue is resolved.

Feel free to contact us in the future if you need any assistance.

Cheers.