Here's a quick no-code method to extract all Team/Group members into an Excel list. I've seen PowerShell scripts that do the same, but this is quick and easy and anyone can do it for any team/group.
Since the Group creates a distribution list of the same name, do the following:
- Enter the group name in a new email
- Expand the group and copy/paste into Excel
- Use Data > Text-to-Columns to split it into columns by semicolon delimiter
- Copy all values
- Paste Special > Transpose
- (optional) Use Data > Text-to-Columns to separate the names and emails into separate columns