@MarkRB 

Hi,

Have you already tried to do the same thing again now? I mean, reset the TL-WPA8635P to factory settings and then re-add it to the C80's EasyMesh/OneMesh network.

The C80 should still support OneMesh with the latest firmware update. (the "EasyMesh" menu in the GUI still mentions both, EasyMesh and OneMesh)

  @woozle Sorry - I have not had the spare time to do that -- but hopefully will be able to ..

Visit TP-Link's official website and navigate to the support section for your specific model. Look for firmware updates, release notes, and any announcements regarding EasyMesh compatibility. If you can't find the information you need on the website, consider reaching out to TP-Link's customer support. They may be able to provide more details on firmware updates and compatibility. Since you mentioned that resetting to factory settings helped in the past, you might try doing this again and carefully follow the setup instructions for integrating the TL-WPA8635P KIT into your OneMesh network. Ensure that the network environment is stable, and there are no interference issues. Check for other electronic devices, appliances, or sources of interference that might affect the performance of your OneMesh network.