Teams Migration. ODM adds the migration service accounts as member or owner to Groups. Gets "Resource is temporarily unavailable. Retrying in 5 minutes...". Slows migration time drastically (4256911)

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Title

Teams Migration. ODM adds the migration service accounts as member or owner to Groups. Gets "Resource is temporarily unavailable. Retrying in 5 minutes...". Slows migration time drastically
Description

we are seeing the event below. The Resource is temporarily unavailable whenever ODM (On Demand Migration) is trying to add the service account as owner or member to Groups. All those occurrences of waiting 5 minutes slows down the migration drastically.

2021-10-29 17:25 Info Application Discovering <Team1> team channels
2021-10-29 17:25 Warning Application Adding <MigrationAdminSource> to group '<GroupA>' as member on the source...
2021-10-29 17:25 Info Application Resource is temporarily unavailable. Retrying in 5 minutes...
2021-10-29 17:30 Warning Application Adding <MigrationAdminTarget> to group <'GroupA>' as owner on the target...
2021-10-29 17:30 Info Application Resource is temporarily unavailable. Retrying in 5 minutes...
2021-10-29 17:35 Info Application Discovering <Team2> team channels
2021-10-29 17:35 Warning Application Adding <MigrationAdminSource> to group '<GroupB>' as member on the source...
2021-10-29 17:35 Info Application Resource is temporarily unavailable. Retrying in 5 minutes...
2021-10-29 17:40 Warning Application Adding <MigrationAdminTarget> to group '<GroupB>' as owner on the target...
2021-10-29 17:40 Info Application Resource is temporarily unavailable. Retrying in 5 minutes...
Cause

On Demand Migration (ODM) adds system account to source group and Microsoft syncs this permission to the team. Sometimes it takes longer, especially if the team contains a private channel(s).
Resolution

Know that MS can take some time to sync this permission to the Team(s), especially if the Team(s) contains a private channel(s). These event messages and the extra time are expected behavior.

Adding the service account in advance would help speed up the migration. In other words, if you added the accounts as a member (source) or owner [target) to the Team before the ODM migration. That would get that out of the way beforehand and avoid all those 5-minute waits.

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Teams Migration. ODM adds the migration service accounts as member or owner to Groups. Gets "Resource is temporarily unavailable. Retrying in 5 minutes...". Slows migration time drastically (4256911)

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