1 - What was the URL of the RSS feed you entered? Ensure it is a valid RSS feed (return RSS XML)
2 - The tweet search uses Twitter's tweet search API, it should search for tweets with all keywords (AND).
For OR use "sip OR panel"
For other options see,
https://developer.twitter.com/en/docs/tweets/search/guides/standard-operators
3 - See above.
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