Add devices to collection errors out

I’m attempting to add machines to a collection en masse, so far it errors out with Collection not found.Ive tried domain\pcname, pcname, domain\pcname. All receive the same error.

Hi Josh,
Are you using a Recast server? The collection not found error indicates that Recast wasn’t able to find the collection to add computers to, which could mean that either impersonation is failing on your Recast server or the service account assigned to your Recast server doesn’t have permissions in ConfigMgr. This site has some information about the different reasons you could see permissions issues with Recast server :

Hope that helps,