<databaseName> cannot be backed up because its 'BackupInProgress' flag is set to 'True'. Check whether the database is being backed up by a different server -- skipping.
A Database Availability Group (DAG) database is skipped from backup if its 'BackupInProgress' flag is set to "True" by Exchange server.
Processing continues, but the specified database is skipped.
Check whether the database is being backed up by a different server. Also check that there is not another instance of tdpexcc.exe or other backup running.