You are trying to access easy extension way too soon. It is not available yet. That happens sometime in March.
If you need to file for an extension for 2019 tax returns then get the form from the IRS site and mail it in. An extension does not give you extra time to pay any tax due. So you have to pay estimated 2019 tax by April 15, 2020.
https://www.irs.gov/forms-pubs/extension-of-time-to-file-your-tax-return
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