Another thing you can do is get an extension for filing your 2021 tax return that will give you until mid-October to file. If you expect to have tax due you need to pay by April 18, but you can wait to file your return when you get the SSN.
https://ttlc.intuit.com/community/extensions/help/how-do-i-file-an-irs-extension-form-4868-in-turbot...
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