Is a digitized signature acceptable for an amended return?

Hello,

I tried to e-file an amended 2021 tax return (before October 17) but there was some software error and despite all the attempts with tech support, I was told I would need to mail in the return. Can I sign with (Mac's) Preview > Annotate > Signature instead of with a pen? It seems from this article that the IRS is now accepting digitized signatures for some forms, but not for a 1040X. Can someone recommend a digital-signature method?

I see something with getting a PIN but it seems to be for tax preparers, and complicated. My taxes are self-prepared with TurboTax.

Thanks!