I am unable to print yesterdays scan form. Yesterday it did not give me the option to print it out. I went back today to see if I could do it, but it still won't allow me to print.
Try in the morning. Could be because it's a Federal holiday today.
"It is only possible to print a SCAN form for postage labels that have both a purchase date and dispatch date of today. It is not possible to print SCAN forms for labels purchased on different days. "
https://help.etsy.com/hc/en-gb/articles/360000336887-How-to-Print-a-USPS-SCAN-Form?segment=selling