I've been working on an app that includes functionality that will automatically post comments and photos to a meetup event for a user.
When it's sent to the test group (that the user is a member of), the posts and photos appear. However, when posting a comment to an event (POST /:urlname/events/:event_id/comments) in other groups, it's been returning a 400 with the code 'member_error' and description 'Invalid member'.
The error code doesn't seem to be defined in that context in the docs, though I don't think that it would be a stretch to think that it is an indication that the user must be a member of the group to perform these actions. Is this the case? If so, what other endpoints can this error code be returned by?
Also, if it's the case that a user must join a group to comment on an event, is there a limit to the number of groups a user can join, as there is with the number of comments a user can make?