"The IRS notice telling me my effective start date for the S-Corp is dated 2/10/2020."

The Notice has a Date on it, that reflects the IRS date of the correspondence. Bob was asking about this date. Not the date of the corporation, but the date of the work you paid someone to do for you.

The issue seems to be that perhaps your accountant did not submit the work timely, in the first place. They sure don't seem to know how to follow up with the requested statements. Resending the same info as first sent, but by fax, is not fulfilling the request to send the missing statements.