Thank you for posting your question in the Microsoft Q&A forum for reaching out regarding the issue with SPMT and the destination URLs containing periods in the username.
While periods (.) in usernames are technically supported in OneDrive personal site URLs, we’ve observed that SPMT can sometimes fail to process these URLs correctly, especially during bulk imports, if the URL format doesn’t exactly match the provisioned OneDrive site structure.
To avoid this issue, we recommend using the format where periods are replaced with underscores (_) in both the username and domain parts of the URL. This aligns with how Microsoft typically structures OneDrive personal site URLs (e.g., ******@domain.com becomes john_doe_domain_com).
We hope the details provided will assist you effectively.
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