As of yesterday Play.com officially closed its doors and said goodbye to the ecommerce world. Therefore it is no longer an active channel with Feed Manager.
Rakuten.co.uk is replacing play as Rakutens marketplace in the UK. If you are not selling on Rakuten and would like to then click this link to register interest. It may even be possible for them to migrate your play.com listings over.
Existing clients shall have 3 months (until July 1st) to still access play accounts and fulfil outstanding orders/settle balances.