This report will allow you to find Site Collections associated to Microsoft 365 Groups.
- Click All reports.
- Click Create custom report.
- Select Object Type - Site Collection.
- Specify Site Template - is - Team Site (Microsoft 365).
- Select your preferred columns or leave as is.
- Select your target.
- Click Continue without saving.
- You will now have a list of all site collections associated to a Microsoft 365 Group in your report results.