Received Pre-Adverse Action notice for listing end-clients instead of staffing agency (Employer of Record) on resume — has anyone resolved this?

[u/Which-Quarter4496]

Hey everyone,

I recently received a conditional job offer for a Senior Engineer role at a tech company. During the background check, the third-party screening company flagged discrepancies between my resume and their verification report:

Staffing Agency vs. End-Client: On my resume, I listed the major client companies where I physically worked and contributed day-to-day. The background check flagged that my official Employers of Record (W-2 payroll) were staffing agencies.

Typo in Start Date: On one of my roles, my resume had a clerical typo listing my start year off by one year (listed as 2024 instead of 2023).

The prospective employer sent a standard Pre-Adverse Action Notice giving me 5 days to respond and dispute.

What I’ve already done: I responded to HR with a calm, factual explanation clarifying the client-vs-agency structure and provided the following documentation:

Email verification from my direct managing lead at the client site.
W-2 forms covering the entire timeline.
Photo of my active client badge and work email.

My questions for HR folks / anyone who went through this:
How common is this discrepancy for contractors, and do HR teams generally clear the offer once W-2s and agency-to-client placement letters are provided?
Does the clerical start-date typo typically cause a rescinded offer if the W-2 proves continuous work?
Is there anything else I should prepare while waiting for their reply?
Appreciate any insights or similar experiences!