# Troubleshooting Microsoft 365

## SharePoint Online: Post-Restore Metadata Behavior for List Items

When restoring a SharePoint Online list item that contains attachments, discrepancies in version history and metadata values such as Modified By and Modified Time are expected—especially if the item was edited multiple times before and after attachments were added.

## Performance of Backup and Restore Operations

The ability of Microsoft APIs to discover, access, and read data can affect the performance of backup and restore operations. Some factors include,

- Extremely large folder nesting hierarchy and number of files in all mailbox types.

- Large numbers of OneNote file items.

## Exchange and Exchange Online Mailbox Backups Take Too Long

For more information, see KB article 82856

## Error: AADSTS7000222: The provided client secret keys are expired.

For more information, see KB article 67560.

## Error: Unable to connect to tenant with primary app [f153a0d7-c8c0-404a-b54c-bec1b7e3f914]. Please verify the credentials

For more information, see KB article 67500.

## Failed to process mailbox. The operation failed and Mailbox doesn't have a valid license.

For more information, see KB article 67622.

## Mass Restore for Exchange Online and OneDrive for Business

For more information, see KB article 89228.

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