I'll leave an old comment of mine here with some edits, might be helpful. I once applied for a customer service job and had rather obvious blocks and stutters during the interview. The two managers interviewing me noticed, and one of them just straight up asked me about it. He immediately declared his curiosity about the cause (chronic or just nervousness) since he had never seen something like it before and asked me if I thought it would be an issue. I really liked the approach because personally I felt like I didn't have to try to hide it anymore and their willingness to just talk about it showed me that I was not making them uncomfortable. On an idividual basis, when interacting, keeping your attention on the person and not interrupting or finishing sentences for them can go a long way. So, basically just being patient and attentive is what I would recommend. That alone can go a long way.