Hi @SARTEEL Christophe,
The issue you're experiencing with different search results for UserA and UserB, despite having the same permissions, may be related to how access control lists (ACLs) are synchronized and interpreted in the hybrid search setup.
To ensure that both users see the same results, consider assigning access rights using a security group that is not excluded from synchronization, such as the Everyone group or a custom group. This way, the ACLs for the files can be correctly recognized and translated for both users, ensuring they receive the same search results.
Additionally, check if there are any specific query rules or filters applied to the search results that might affect what each user sees.
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