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Hi ASM2030,
Based on the information provided, it appears that you have already completed the standard troubleshooting steps typically recommended for SharePoint Online Search Schema issues, including reindexing the library and site, verifying search settings, confirming that items are searchable, and allowing sufficient time for indexing to occur. The fact that newly created custom site columns are also affected suggests that this may not be an issue with a specific column configuration or content type.
As a few additional validation steps, you may consider:
- Verifying whether any automatically generated managed properties exist for the affected columns
- Creating a new test column in a separate library or site collection to determine whether the behavior is isolated or tenant wide.
However, given that the issue impacts multiple newly created columns and that the expected crawled properties are not being generated after an extended period, there is a possibility that the problem is related to the SharePoint Online search backend rather than tenant configuration. Similar cases have required investigation by Microsoft's Search or Search Schema engineering teams.
Since you already have an active support case open with Microsoft, I recommend continuing to work directly with the assigned Support Engineer and requesting escalation if the issue remains unresolved. When engaging with the engineer, it would be helpful to provide:
- Tenant ID
- Site URL
- Library URL
- Internal name of the affected column(s)
- Sample document or item URL containing populated metadata
- Confirmation that reindexing has been completed and that items are already discoverable through search
I would recommend asking the Support Engineer to review whether there are any known service-side issues affecting crawled property generation and, if appropriate, engage the SharePoint Search Engineering team for further investigation. Based on the troubleshooting already performed, a backend investigation may be necessary to determine why crawled properties are not being surfaced for newly created custom columns.
Please keep me and other users updated on the outcome of the support escalation, as the Support Engineer will be best positioned to verify whether additional backend diagnostics or remediation actions are required.