Approve Permissions for Application in "Main" Channel not working. Channel.Admin is SpaceApp?

Hi,

we previously had an application running that was able to post messages to the main channel. I already filed a bug that the servers responds with a 500 when the application does not have the permission "View Messages".

Now, I wanted to update the applications permission with "View Messages". From now on, the channel shows a "approve" button to approve the newly added permission for the channel. Unfortunately, there are no "reject" or "approve" buttons available, see screenshot:

When trying to grant the permissions via API Playground, I get the following response:

{
  "error": "permission-denied",
  "error_description": "Permission is not granted: Channel.Admin"
}

Using API Playground to see who is the Channel Admin and the responds is:

{
  "name": "JetBrains Space",
  "details": {
    "className": "CBuiltInServicePrincipalDetails",
    "name": "JetBrains Space",
    "key": "SpaceApp"
  }
}

I'm also not able to add myself as channel admin, because I don't have enough permissions for that.

What can I do to get this application running again in that channel?

Thank you for your help.

Best regards
Norbert