You are stuck and must file via mail.
I am not sure what you mean by backlog. If you never did 2021 taxes until far too late, the IRS may have never processed your 2021 taxes, hence you have no AGI yet (at least not on-line).
Hence, print and mail your taxes.
Next year, you should be OK - hopefully.
Its a "catch 22"... until the IRS finally processes your previous year's taxes, there is nothing on-line at the IRS that TurboTax (or anyone) can pull to check.
