Backup not working

Question

Backup not working

iCOMPASS Consultant 20

We migrated our live application to this new tenant. Since then, the backup has failed.

Andreas Baumgarten 123.7K Reputation points MVP Volunteer Moderator

2025-06-21T05:48:17.2966667+00:00

Hi @iCOMPASS Consultant ,

maybe it's possible to provide some more details/context?

What you try to backup?

How is backup configured?

Do yo see any error message/detail for the failed backup?

(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

Regards

Andreas Baumgarten
Naveena Patlolla 3,850 Reputation points Microsoft External Staff Moderator

2025-06-23T02:38:24.57+00:00

Hi iCOMPASS Consultant
Could you please provide the above requested details for further investigation?
Alex Burlachenko 11,035 Reputation points

2025-06-23T07:26:06.1233333+00:00

hi there! thanks for posting this,

lets tackle the microsoft side of things. if u're using azure backup, check the backup policy settings https://docs.microsoft.com/en-us/azure/backup/backup-azure-backup-faq. sometimes migration resets permissions. make sure the backup service principal has 'contributor' rights on the storage account https://docs.microsoft.com/en-us/azure/role-based-access-control/overview. also, peek at the activity logs in azure portal, those logs love to spill the tea on what went wrong ))

oh and dont forget the classic, storage account firewall rules! migration might've flipped them on. here's how to whitelist the backup service https://docs.microsoft.com/en-us/azure/storage/common/storage-network-security.

if u're dealing with sql, run a quick 'checkdb' to rule out corruption https://docs.microsoft.com/en-us/sql/t-sql/database-console-commands/dbcc-checkdb-transact-sql. try a manual backup to a local path first, if that works, the issue is likely network or permissions. this might help in other tools too.

compare the old and new tenant's network security groups side by side. sometimes migration tools miss tiny but critical rules.

hope this gets u back on track,

rgds,

Alex
Naveena Patlolla 3,850 Reputation points Microsoft External Staff Moderator

2025-06-24T06:00:43.9366667+00:00

Hi iCOMPASS Consultant,

Just checking in to see if the below comment provided by @Alex Burlachenko helped.

Please let me know if you face any challenge here, I can help you to resolve this issue further.

If the comment was helpful, please click "Upvote"
Vinod Pittala 4,335 Reputation points Microsoft External Staff Moderator

2025-06-26T07:22:01.9833333+00:00

Hi iCOMPASS Consultant,

We have reached out you via private message, please respond.

Thanks

Accepted answer

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Your answer

Andreas Baumgarten 123.7K Reputation points MVP Volunteer Moderator

2025-06-21T05:48:17.2966667+00:00

Hi @iCOMPASS Consultant ,

maybe it's possible to provide some more details/context?

What you try to backup?

How is backup configured?

Do yo see any error message/detail for the failed backup?

(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

Regards

Andreas Baumgarten
Naveena Patlolla 3,850 Reputation points Microsoft External Staff Moderator

2025-06-23T02:38:24.57+00:00

Hi iCOMPASS Consultant
Could you please provide the above requested details for further investigation?
Alex Burlachenko 11,035 Reputation points

2025-06-23T07:26:06.1233333+00:00

hi there! thanks for posting this,

lets tackle the microsoft side of things. if u're using azure backup, check the backup policy settings https://docs.microsoft.com/en-us/azure/backup/backup-azure-backup-faq. sometimes migration resets permissions. make sure the backup service principal has 'contributor' rights on the storage account https://docs.microsoft.com/en-us/azure/role-based-access-control/overview. also, peek at the activity logs in azure portal, those logs love to spill the tea on what went wrong ))

oh and dont forget the classic, storage account firewall rules! migration might've flipped them on. here's how to whitelist the backup service https://docs.microsoft.com/en-us/azure/storage/common/storage-network-security.

if u're dealing with sql, run a quick 'checkdb' to rule out corruption https://docs.microsoft.com/en-us/sql/t-sql/database-console-commands/dbcc-checkdb-transact-sql. try a manual backup to a local path first, if that works, the issue is likely network or permissions. this might help in other tools too.

compare the old and new tenant's network security groups side by side. sometimes migration tools miss tiny but critical rules.

hope this gets u back on track,

rgds,

Alex
Naveena Patlolla 3,850 Reputation points Microsoft External Staff Moderator

2025-06-24T06:00:43.9366667+00:00

Hi iCOMPASS Consultant,

Just checking in to see if the below comment provided by @Alex Burlachenko helped.

Please let me know if you face any challenge here, I can help you to resolve this issue further.

If the comment was helpful, please click "Upvote"
Vinod Pittala 4,335 Reputation points Microsoft External Staff Moderator

2025-06-26T07:22:01.9833333+00:00

Hi iCOMPASS Consultant,

We have reached out you via private message, please respond.

Thanks

Answer 1

Hello Hi iCOMPASS Consultant,

Following the transfer of your Azure subscription from one tenant to another, we observed that the system-assigned managed identity (MSI) associated with the existing backup vault—originally configured under the previous tenant—remained enabled. However, due to the tenant change, the backup operations (specifically blob backups) began failing with the error: "UserErrorInvalidAuthenticationTokenTenant."

To resolve this issue, we re-enabled the system-assigned managed identity on the backup vault within the new tenant context. Subsequently, we assigned the necessary roles: Backup Contributor and Storage Blob Data Contributor. After allowing some time for the changes to propagate, we initiated a manual backup.

We’re pleased to report that both the manual and scheduled backups completed successfully, confirming that the reconfiguration was effective.

Please do not forget to "Accept the answer” and “upvote it” wherever the information provided helps you, this can be beneficial to other community members.it would be greatly appreciated and helpful to others.

Thanks

iCOMPASS Consultant 20 Reputation points

2025-07-02T06:15:16.49+00:00

Thanks Vinod for your help!

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Backup not working

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