5000 memberships? I thought this was Google?
com.google.apps.framework.request.StatusException: <eye3 title='FAILED_PRECONDITION'/> generic::FAILED_PRECONDITION: User 91363953886 has 5309 total memberships, can not mutate to reach 5310 as that is over the limit of 5000 ;AppErrorCode=9;StartTimeMs=1519173416402;tcp;Deadline(sec)=9.664;ResFormat=UNCOMPRESSED;Originator=corp-loas-proxy;Tag=cidc3;ServerTimeSec=0.365905408;LogBytes=256;Non-FailFast;EndUserCredsRequested;EffSecLevel=none;ReqFormat=UNCOMPRESSED;ReqID=feead50e0dd47f81;GlobalID=d58444c9b3c68ad4;Server=10.2.37.199:4113