Issue with the pin message features in the text chat of voice channel

I'm trying to pin a message in the new text chat that has been added with the last update, those that can be found directly in the voice channel, but discord doesn't allow me, the other mod or even the server owner to do that. Every time someone hit "Pin message" discord send a disclaimer that says: "Discord is unable to pin that message. You may have hit the limit of 50 pins in (name of the voice channel)". No one ever pinned a message in this new chat, I checked the settings of the server and voice channels but everything seems fine, moderators are allowed to pin messages. This issue also occurs on the mobile app, but this time the disclaimer sent by discord says: "A message can only be pinned to the channel it was sent in"