@albgen 

May I please have the hardware version of your deco (found on the bottom of your deco) and the firmware version (found in the deco app)

Also you will find some troubleshooting steps below. If none of the steps below work please let me know and I will get a member of the tp-link stafff to assist you

To troubleshoot a printer not showing as online on your Deco network, restart both your printer and the Deco system, then verify the printer is on the same network band (2.4GHz vs 5GHz). If it's still offline, reinstall the printer drivers and check for IP address conflicts or issues with the printer's static IP settings. You may also need to disable router firewall or MAC filtering temporarily to test connectivity. 

1. Basic Troubleshooting Steps

• Power Cycle Devices:

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  Restart your printer and the entire Deco system by unplugging them, waiting 30 seconds, and plugging them back in. 

• Check Wi-Fi Network:

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  Ensure your printer is connected to the correct Wi-Fi network name (SSID) and has the right password. 

• Verify Network Band:

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  Some printers only support the 2.4GHz band, so confirm your printer is on the same band as your Deco system. 

2. Network and IP Address Issues

• Restart the Printer's Network Connection:

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  On the printer itself, try to reset its connection to the Wi-Fi network. 

• Check DHCP Settings:

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  Make sure your Deco system is set up to act as the DHCP server to assign IP addresses automatically. 

• Check IP Address:

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  Verify the printer has an IP address within the same subnet as your Deco system. 

• Disable Router Firewall/MAC Filtering:

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  Temporarily disable any firewall or MAC filtering settings on your Deco router to see if this resolves the connectivity issue. 

3. Reinstall and Update

• Update Printer Firmware and Drivers:

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  Install the latest firmware and drivers for your printer from the manufacturer's website or through a dedicated app (like HP Smart). 

• Reinstall the Printer:

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  Remove the printer from your computer's control panel and then add it again as a new device to force a fresh connection. 

4. Advanced Steps (if needed)

• Test with a Different Port/Cable:

  If your printer is wired, try a different Ethernet port on the Deco unit or use a different Ethernet cable to rule out hardware problems. 

• Disable Fast Roaming:

  Some mesh systems use a feature called "Fast Roaming" that can cause issues with printers. Try disabling this feature in your Deco app settings to see if it helps