AD LDAP connector has strange issues with connection

ERROR (com.evolveum.midpoint.provisioning.ucf.impl.connid.ConnIdUtil): ConnId Exception org.identityconnectors.framework.common.exceptions.ConnectorIOException in connector:f78d1a45-65be-4bb0-bf41-fbd02f391aca(ConnId com.evolveum.polygon.connector.ldap.ad.AdLdapConnector v3.1-SNAPSHOT): ConnectorSpec(resource:5a55bc1a-95c0-11ea-bc3c-abbaf8e94a00(EXAMPLE (COM)), name=null, o! id=f78d1a! 45-65be-4bb0-bf41-fbd02f391aca) while getting object identified by ConnId UID '7a0da54c-1e5e-48fc-9ae4-9fa7214c316a': LDAP error during search in : operationsError: 000004DC: LdapErr: DSID-0C0907E1, comment: In order to perform this operation a successful bind must be completed on the connection., data 0, v2580? (1)

org.identityconnectors.framework.common.exceptions.ConnectorIOException: LDAP error during search in : operationsError: 000004DC: LdapErr: DSID-0C0907E1, comment: In order to perform this operation a successful bind must be completed on the connection., data 0, v2580? (1)

at com.evolveum.polygon.connector.ldap.LdapUtil.processLdapResult(LdapUtil.java:580)

at com.evolveum.polygon.connector.ldap.search.DefaultSearchStrategy.search(DefaultSearchStrategy.java:151)

at com.evolveum.polygon.connector.ldap.ad.AdLdapConnector.searchByUid(AdLdapConnector.java:426)

at com.evolveum.polygon.connector.ldap.AbstractLdapConnector.executeQuery(AbstractLdapConnector.java:506)

at com.evolveum.polygon.connector.ldap.AbstractLdapConnector.executeQuery(AbstractLdapConnector.java:120)

at org.identityconnectors.framework.impl.api.local.operations.SearchImpl.rawSearch(SearchImpl.java:197)

at org.identityconnectors.framework.impl.api.local.operations.SearchImpl.search(SearchImpl.java:133)