trouble migrating

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Hallo everybody.

If I get to https://web.teamviewer.com/remote-support my devices are listed and most if not all of them say that a migration is requested (I am translating from my italian interface).

Then I go here https://web.teamviewer.com/devices/outdated

and clic to start the migration.

I land here https://login.teamviewer.com/nav/manageddevicev2/device-migration where I clic «Update», then migrate automatically.

Then I am stuck here

which is phase 2 of 2 of creating target groups and updating devices.

Sometimes I get stuck and some other times a generic error arises.

Any hint?

Thank you and have a nice weekend.