They stopped taking them as a result of the CMKX cert pull. That drove them crazy.
Nobody wants to deal in certs except for a very few people obsessed with NSS. The SEC, FINRA, and DTCC would like to see complete dematerialization. Many exchange-listed companies have obliged, and no longer use certificates. But as far as I know, no--or at least very few--OTC issuers have taken that course.
I was actually wrong in what I said earlier: Xena reported that she'd tried to DWAC the stock to another brokerage. But that's in a way the same thing.
It might be helpful if we knew what stock she was talking about.