Hi @DM
If there are any large files or folders in Dropbox, they might cause the migration process to timeout or fail. Consider reducing the size of these files or breaking them into smaller parts. Microsoft supports files up to 15 GB in size for Dropbox to Microsoft 365 migrations.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.