"EIP" is in the code for EIP. PPD can be from an offset, such as debt collection. Did your client have another code, such as 449 or 310? Did you or they pull their Tax Account Transcript?

Here's an example of how it looks, and it should show them more info:

https://www.taxpayeradvocate.irs.gov/news/nta-blog-transcripts-pt2/