If we overlook the fact that this represents an over-complicated digital-to-analogue-to-digital configuration, the D50s is the wrong device - it's a bluetooth receiver. Bluetooth speakers also include a bluetooth receiver - so what you need is a bluetooth
transmitter (as Laserjock mentioned) - and since your source device (CD player) is digital, go one step better and get a bluetooth transmitter with coaxial s/pdif input -
https://www.ebay.com/itm/265056953903
Pair the phone directly to the bluetooth speakers.