Playback Button does not work

Thanks for having me! I have a question and would be very grateful if someone could help me. I have downloaded the new 3.0.2 Version of Audacity on my Windows 10 PC and I am having some serious problems. It is my intention to record a vocal track together with MP3 song track. I opened my MP3 Music file and transferred in into Audacity. Pressed the playback button to hear the playback and nothing happens. The cursor does not move a millimeter. On my old version, I could then press the record button and the vocal track would automatically appear parallel with the playback WAV track. Thanks in advance for any solution.

What settings do you have in the Device Toolbar?