Comment 11 for bug 1915511

Thanks Ian for the explanation, but I think this needs to be added in the section "For migration to work" in this documentation : https://juju.is/docs/migrating-models

I also tried another time with all the units active idle (green), but still have this issue. Here is the logs of one of the failed agents: https://pastebin.canonical.com/p/52JfN42mBz/