Oh, coop only have 2 relays to get user's kind 10050, which are relay.damus.io and relay.nostr.net. Maybe your relay list isn't published to there. I will push a update to let user config the default relays as well as change the default relay set to more popular relays or just use some bostr relays too.
Thank you. My suggestion is that instead of adding a config option you hardcode purplepag.es, user.kindpag.es, relay.nos.social and also try to fetch kind 10002 for users from the hardcoded relays and add the results to the list when fetching kind 10050.
I've pushed my kind 10050 to relay.damus.io and relay.nostr.net, but still Coop is saying the same thing.
Oh, I will add some reload mechanisms, instead of stuck like which is bad. Currently, inbox relays only fetch once and save in cache without any reload method, user need to restart app to reset.