I have a similar issue.
Here is what I did.
1) I put together an explanation letter per
@Sm1smom recommendation.
2) I added my Tax Return as well as a bank statement to my explanation letter. I highlighted the refund amount from IRS both in the bank statement and in the Tax return. It kind of shows that I've paid my taxes and I already got a Tax refund from IRS.
3) I've been trying to register an online account on the IRS website. It keeps showing an error. They don't reply via phone either.
So I mailed a 4506-T form to IRS requesting Tax transcript. As per the IRS website, it can take from 3-6 weeks until I receive the transcript.
It's a 2-page form and it's easy to fill-out.
However, the IRS website claims they don't mail physical Tax transcripts, currently. I hope the process's inertion will help me despite the current constraints