Hi,
Are you still having this issue?
Is there any reason you are still with Gluu 3.1.1 (current is 3.1.5 and 3.1.6 soon to be released)
If you could make a small pack with: oxauth.log, oxauth_Script.log and oxtrust.log for a relevant time frame where a single SCIM request is issued, we might look into it. Please ensure logs are set in TRACE level.