I'm trying to connect n8n with Xero using OAuth credentials, but I'm encountering an error during the connection process. I also tried setting up a local Flask server for the OAuth flow, but I'm still facing the same issue. Could someone help me troubleshoot what might be wrong?

I'm trying to connect n8n with Xero using OAuth credentials, but I'm encountering an error during the connection process. I also tried setting up a local Flask server for the OAuth flow, but I'm still facing the same issue. Could someone help me troubleshoot what might be wrong?