Additional meeting and call-related features and issues within Microsoft Teams for Education
What I just found is an easy way to capture people who've joined a meeting (I'm not concerned with how long they stay engaged) is by going to Microsoft Stream. If you've recorded your meeting, when you go to view the recording and edit details, you can select who you want to make the recording available to. The list of everyone who has at one point joined the call should be there. It's much easier to copy the list here than try to copy blocks of names from the list of participants from the Teams meeting. Not perfect, but much easier than having to manually type and record hundreds of names.