We observed below errors in policy servers. Could you please check on the limits/config at policy server end which we can increase/tune to avoid this error.
Policy Server:
Release : 12.8.03 (SP3), 12.8.04 (SP4), 12.8.05(sp5)
Component : SITEMINDER - POLICY SERVER, SITEMINDER ADMINUI, SITEMINDER - FEDERATION
"error: Sizelimit exceeded" means that the AD server is configured to return a certain number of results (with the MaxPageSize parameter), and the query should returns more than this value.
See:
https://techdocs.broadcom.com/us/en/symantec-security-software/identity-security/identity-management-and-governance-connectors/1-0/connectors/microsoft-connectors/microsoft-active-directory-exchange-and-skpye-for-business(lync)/Managing-the-Connection-to-Active-Directory/active-directory-customizations/change-the-active-directory-search-limit.html
See the following non-Broadcom link for an explanation of how to increase MaxPageSize on the active directory:
https://angry-admin.blogspot.com/2017/07/view-and-change-AD-MaxPageSize.html
You should discuss the suitability of doing this with your AD admin first.