Are you using Turbo Tax Online version or the Desktop CD/Download program? The Desktop program doesn't transfer from a 1040SR pdf but the online version should. You need to have the actual electronic pdf file not a printed or scanned copy. But a pdf only transfer very basic info like your name and AGI. Be just as easy to manually enter all your info. So it's probably not worth even trying to transfer it.
How to transfer into Turbo Tax Online, including from a pdf file or other software or from the Desktop program
https://ttlc.intuit.com/community/entering-importing/help/how-do-i-transfer-last-year-s-return-into-...
