aaPanel_thisyear Thanks for the reply. I have found that when panel SSL is enabled, I can't perform the pairing.
I've tried with and without the custom domain name. (So IP address or vanity URL)
I have SSL for that domain working for the domain, but when I try to enable it for the panel, I get a Red Cross and no error message.
I don't think the issue is therefore with the app, but my configuration of SSL for the panel. Will raise my challenge on the SSL panel config in a more appropriate thread since this on relates to the aaPanel mobile app