Webmanager: SMP Error on Acceptance (functioning on Training)

When switching our NCP9 from Training to Acceptance, SMP functions in the WebManager ("list SMP services" & "synchronize search mask" ) give the following error:

SMP ERROR: No NAPTR Record found for services: `Meta:SMP`, schemas: `http, https`, flags: `U`.

Caused by: eu.europa.ec.dynamicdiscovery.exception.DNSLookupException: The SMP URL value for participant [ParticipantIdentifier{identifier='urn:ehealth:AT:ncp-idp', scheme='ehealth-participantid-qns'}] can not be resolved!

at eu.europa.ec.dynamicdiscovery.service.impl.DynamicDiscoveryService.lookupPublisherAddresses(DynamicDiscoveryService.java:399)

at eu.europa.ec.dynamicdiscovery.service.impl.DynamicDiscoveryService.retrieveResourceForIdentifier(DynamicDiscoveryService.java:142)

at eu.europa.ec.dynamicdiscovery.service.impl.DynamicDiscoveryService.getResource(DynamicDiscoveryService.java:109)

at eu.europa.ec.sante.openncp.webmanager.backend.module.smp.smpeditor.web.rest.SMPDeleteFileController.getFilesToDeleteInfo(SMPDeleteFileController.java:116) ... 125 common frames omitted

Configuration used:

SML_DOMAIN=ehealth.testa.eu

SMP_ADMIN_URL=https://smp-cert-auth-test.publisher.ehealth.testa.eu