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Check that office365 domain you wrote to MX value in destination domain's DNS zone has AAAA record
and
check that Postfix on server where you get error isn't configured to use only IPv6.
See Postfix - Host or domain not found
https://docs.plesk.com/en-US/obsidian/migration-guide/migrating-from-supported-hosting-platfoms/migrating-via-the-command-line.75722/
You could configure single account migration according to this guide up to step 9.
Then you could set up cron job with command from step 9 - transfer-accounts...