To get a 60 day extension of stay based on unable to travel due to COVID-19, you *MAY* be asked for one of the following documents:
1. A letter from your embassy saying you can not return, OR;
2. print out from your embassy website saying they don’t issue the letters, OR:
3. print out of a letter from the embassy saying they don't issue those letters.
(Note the word "OR").
See
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(Do a search for COVID-19. You'll find the section that says "COVID-19 Visa Extension Letters")