Token expires in Dropbox to Onedrive/SPO Migrations
説明
After November 2021 new generated tokens do not have the "no-expire" option, now all the tokens are short-life and may expire in a couple of hours during the migration.
原因
This is a known issue. # 519651.
対策
Our development team is aware of this issue and is working towards a solution in a future release of Essentials for Office 365.
As a temporary workaround, some customers may need to re-generate tokens to continue with migrations.