I'm leading a team of 4 developers. 1 senior developer, the rest junior developers.

This sprint, all junior developers were working on some Legacy tickets. I was working with the Sr developer to overcome a technical challenge for a major defect he was working on, and we succeeded.

The problem is that the Jr developers have been spending ALL their time this sprint working on the legacy user stories. One of the Jr developers who is more experienced in this area has been doing recorded KT sessions for others and they have been using videos as documentation, which is making me furious.

Basically, the things that are making me furious, and I will bring these up during the retro:

• Using recorded videos as documentation
• Not being vocal about the actual progress during DSUs. Downplaying things and being overly optimistic.
• Not asking for help. I asked them multiple times how I can assist them.

Today is the last day of the sprint, and I'm pretty sure their tickets are rolling over and I blame myself for not being involved with their work. I feel no bueno. Anyone experiencing a similar situation?