Most common causes for these errors are:
- You're trying to fetch a metric or dimension that doesn't exist (you might have misspelled the name).
- You're not connected to the Internet.
- Excel can't connect to the Internet due to a firewall blocking it.
- Excel can't connect to the Internet due to proxy settings preventing it.
In the case of firewall or proxy settings preventing the connection, work with your internal IT administrator to help check and address any issues with those and make sure the settings are correct. This article may also be useful: https://support.supermetrics.com/support/solutions/articles/19000050123-how-do-i-use-the-functions-when-connecting-via-a-proxy-server-