Hi @Felix Read,
As far as I know, the graph search api doesn't support custom field currently. The queryString shouldn't contain custom field. The queryString should be like following
POST https://graph.microsoft.com/v1.0/search/query
{
"requests": [
{
"entityTypes": [
"driveItem"
],
"query": {
"queryString": "(LastModifiedTime>2024-05-16 AND path:\"https://contoso.sharepoint.com/sites/siteName\")"
}
}
]
}
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