which audio music format can I use to burn a cd which plays on phillips CD sound machine model AZ 2020/00 220V-230V-50H

Hallo ,
Using Windows 10. Using Audacity 3.0.0
which audio music format files can I use to burn a cd which plays on a Philips CD sound machine model AZ 2020/00 220V-230V-50Hz 23W product no KT000101026531 I have tried with WAV and FLAC. the cd will play on an inexpensive living room cd box that plugs into the wall but will not play on the more expensive philips CD portable sound machine (model no above)that belongs to my friend/ Please advise which musical file format I can use. much appreciated. Thanks
Jenlaybutt

According to the on-line manual (https://download.p4c.philips.com/files/a/az2020_00/az2020_00_dfu_eng.pdf) it looks like it only supports “audio CD”.
Note that when you create a CD, the CD burning program usually has an option to select either “Audio CD” or “Data CD” - you need to select “Audio CD”.
It is usual to create Audio CDs from stereo WAV files.