If you are trying to use Copilot on Word Online or in PowerPoint Online and you are seeing an error like this:
We encountered a problem validating your Copilot license. For more information, see https://aka.ms/copilotlicensecheck
This is due to Copilot needing 3rd party cookies enabled in your browser for Copilot to work correctly. You can choose this for just particular sites by clicking this on the browser address bar like in Google Chrome:
Or in Microsoft Edge:
Thank you for using Copilot we look forward to your feedback and what prompts are useful for you.