SharePoint Migration Tool should support migrating to O365 Team Sites
Currently it gives an "Access denied" error, but it doesn't really make any sense why O365 Team Sites would not be supported as a destination. There are many scenarios where this is commonly needed for some customers who have Sharepoint sites setup as O365 Team Sites and not as an SPO Site Collection. Just in general as well this would be a handy option to have.
Please consider this as a future improvement to the SPMT. Thanks

Greetings,
Every 0365 teams sites are connected to a SPO site collections You can therefore go to that site and migrate to it if you are the site admin.
We are working on new improvements to make moving to Teams even easier.
1 comment
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Toby commented
Hi, you can do this with the PowerShell cmdlets, that's what we're doing at the moment.
Something like: Add-SPMTTask -FileShareSource "xxxxxxxx" -TargetSiteUrl xxxxxxxx -TargetList Documents -TargetListRelativePath "Top Folder/Sub Folder" the Site URL is just the SiteURl xxx/sites/msteams_xxxx