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MigrationWiz Document Migration Errors Following a system upgrade on August 19, 2026 that improved overall document migration speed and throughput, we have identified an issue affecting a small subset of customers. Some users may encounter one of the following errors during document migrations: "Collection was modified; enumeration operation may not execute." "Offset and length were out of bounds" "Did not read all bytes from file." These errors are not indicative of data loss. They are the result of a DLL upgrade included in the August 19 release, which causes logs generated prior to the upgrade to be unreadable by the updated code. We are aware of the issue and actively working on a broader resolution. Recommended Steps If you are experiencing one of the errors above, please perform a Reset Items and resubmit the migration pass. This resolves the issue in most cases. For instructions, see How to Reset Items in MigrationWiz. https://help.bittitan.com/hc/en-us/articles/360042167494-MigrationWiz-Statistics-Statistics-Lookup#01H8HEMGW00PCG8XHWPM7QHWJD If the error persists after performing a Reset Items, please open a Support Case so our team can assist you directly while we work on a broader fix. We will provide updates here as our investigation continues.

This incident has been resolved.

We are currently investigating an issue affecting OneDrive to OneDrive migrations that use Delegate Application authentication. Customers may encounter the error message "Your migration failed while checking destination credentials" when attempting to run migrations under this configuration. Our engineering team is actively investigating the root cause. No action is required on your part at this time. We will provide updates as our investigation progresses. We apologize for any inconvenience this may cause.

The root cause has been determined, and we are working to release a change to address this error shortly.

We have resolved the issue affecting OneDrive to OneDrive migrations using Delegate Application authentication. Customers who previously encountered the error message "Your migration failed while checking destination credentials" should now be able to run migrations successfully. If you continue to experience issues, please resubmit your migration. If problems persist, contact our support team. We apologize for any inconvenience this may have caused.