Unfortunately, I only receive one bad request

Make sure to have the right kind of quoutes:
[spotifyplaybutton play="spotify:track:2MlOUXmcofMackX3bxfSwi"]

Wow … great … that was it. Many Thanks. I had the code from the description.
Thank you and stay healthy.

Yes, the markdown implementation isn’t that great. I corrected it now by showing it as code.

I you like the plugin, please consider adding a review. I would mean a lot!