and cas.serviceRegistry.json.location=file:///etc/cas/services is correctly configured:
cas.properties:
logging.config=file:/etc/cas/config/log4j2.xml
cas.serviceRegistry.initFromJson=true
cas.serviceRegistry.json.location=file:///etc/cas/services
cas.authn.accept.users=
### Connexion LDAP
cas.authn.ldap\[0\].providerClass=org.ldaptive.provider.unboundid.UnboundIDProvider
cas.authn.ldap\[0\].type=AUTHENTICATED
cas.authn.ldap\[0\].useSsl=true
...
2020-09-25 13:02:49,081 INFO [org.apereo.cas.services.AbstractServicesManager] - <Loaded [1] service(s) from [JsonServiceRegistry].>
2020-09-25 13:03:01,934 DEBUG [org.apereo.cas.ticket.registry.AbstractMapBasedTicketRegistry] - <Ticket [TGT-1-*****8ovoFM8IAk-belenios] could not be found>
25-Sep-2020 13:03:02.176 WARNING [https-jsse-nio-443-exec-6] javax.persistence.spi.PersistenceProviderResolverHolder$DefaultPersistenceProviderResolver.log javax.persistence.spi::No valid providers found.
2020-09-25 13:03:02,207 DEBUG [org.apereo.cas.web.flow.login.InitialFlowSetupAction] - <Setting path for cookies for warn cookie generator to: [/cas/]>
2020-09-25 13:03:02,208 DEBUG [org.apereo.cas.web.flow.login.InitialFlowSetupAction] - <Setting path for cookies for TGC cookie generator to: [/cas/]>
2020-09-25 13:03:02,218 WARN [org.apereo.cas.services.RegisteredServiceAccessStrategyUtils] - <Unauthorized Service Access. Service [] is not found in service registry.>
2020-09-25 13:03:04,029 DEBUG [org.apereo.cas.web.view.CasReloadableMessageBundle] - <No properties file found for [classpath:custom_messages_en] - neither plain properties nor XML>
2020-09-25 13:03:04,030 DEBUG [org.apereo.cas.web.view.CasReloadableMessageBundle] - <No properties file found for [classpath:custom_messages] - neither plain properties nor XML>
2020-09-25 13:03:04,031 DEBUG [org.apereo.cas.web.view.CasReloadableMessageBundle] - <No properties file found for [classpath:messages_en] - neither plain properties nor XML>
2020-09-25 13:03:04,039 DEBUG [org.apereo.cas.web.view.CasReloadableMessageBundle] - <Loading properties [messages.properties] with encoding 'UTF-8'>
2020-09-25 13:03:04,822 DEBUG [org.apereo.cas.ticket.registry.AbstractMapBasedTicketRegistry] - <Ticket [TGT-1-*****8ovoFM8IAk-belenios] could not be found>
2020-09-25 13:03:05,205 DEBUG [org.apereo.cas.ticket.registry.AbstractMapBasedTicketRegistry] - <Ticket [TGT-1-*****8ovoFM8IAk-belenios] could not be found>
2020-09-25 13:03:07,952 INFO [org.apereo.cas.services.AbstractServicesManager] - <Loaded [1] service(s) from [JsonServiceRegistry].>
2020-09-25 13:03:17,974 INFO [org.apereo.cas.ticket.registry.DefaultTicketRegistryCleaner] - <[0] expired tickets removed.>
2020-09-25 13:03:17,975 DEBUG [org.apereo.cas.ticket.registry.DefaultTicketRegistryCleaner] - <Finished ticket cleanup.>