This report will allow you to find Site Collections associated to Microsoft 365 Groups.
How-To
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.