TF261xxx: Team Foundation Server could not contact the SCVMM server specified by the migrated team project collection. The ...

TF261xxx: Team Foundation Server could not contact the SCVMM server specified by the migrated team project collection. The following host is currently unavailable: {0}. Wait several minutes, and then try the attach operation again. Alternatively, you can delete the obsolete lab objects on Team Foundation Server using the command 'TfsConfig lab /collectionName:mycollection /delete /noprompt'.