Hi Jason,
So in the end SAP gave a response that worked.
We actually had to delete the BYPASS_INB_HANDLER parameter and change our URL slightly. That helped and now the items check back in to EBP without issues.
The strange thing is that we still have that parameter in every other environment and yet it still works flawlessly, only causing issues in PROD. We are waiting on a response from them to ellaborate why... I am going to share when they respond.
Thank you for all the help!
Bests,
Niki