Sorry to hear that filtering for the
publisherProfiles endpoint is returning an HTTP 500 error for you. From what I can see,
domains is a filterable field, and a filter such as "domains:
x.com"
should work. I went ahead and tried on my end, and unfortunately also see the HTTP 500 response. Since this has been reproduced, I consider this a bug and will be following up with the engineering team to investigate internally. I'll follow up here as that investigation proceeds.