Problems blacklisting publisher reachmobi-whowizzle-slideshow, reachmobi-travelmanner-slideshow

We are having problems blacklisting a publisher. We are sending this request

curl --location --request PATCH 'https://backstage.taboola.com/backstage/api/1.0/[acctId]/campaigns/[cid]'
--data-raw '{
"patch_operation": "ADD",
"publisher_targeting": {
"publishers": [
"reachmobi-whowizzle-slideshow",
"reachmobi-travelmanner-slideshow"
]
}
}'

And getting a

2020-10-05 12:57:54 INFO CommunicationInterceptor:19 [main] - --> PATCH https://backstage.taboola.com/backstage/api/1.0/[accountId]/campaigns/[campaignId]' (131-byte body)
2020-10-05 12:57:54 INFO CommunicationInterceptor:19 [main] - <-- 200 OK https://backstage.taboola.com/backstage/api/1.0/[accountId]/campaigns/[campaignId]' (392ms, unknown-length body)

But when we look into the blacklisted publishers these sites do not show up.

Can you someone check why this is happening?