The 4868 Request for extension says:
IRS individual taxpayer identification numbers (ITINs) for aliens. If you’re a nonresident or resident alien and you don’t have and aren’t eligible to get an SSN, you must apply for an ITIN. Although an ITIN isn’t required to file Form 4868, you’ll need one to file your income tax return. For details on how to apply for an ITIN, see Form W-7 and its instructions. If you already have an ITIN, enter it wherever an SSN is requested. If you don’t have an ITIN, enter “ITIN TO BE REQUESTED” wherever an SSN is requested.
Also, this link may be useful: Tax Residency Status – First-Year Choice. @Claudio111793
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