Help me identifying the issue please

Brought my bike into service last week and picked it up yesterday. I listened to music and didn’t drive fast after I picked it up so I didn’t notice it first. But later that evening I heard this annoying noise coming from my rear derailleur. And had a rather annoying 50 minute commute this morning.
I’m hoping that it’s a rather easy fix and that I don’t have to bring it back again.