So the traefikdomaintld router is well configured.
time="2021-11-04T14:30:27Z" level=debug msg="Configuration received from provider consulcatalog: {\"http\":{\"routers\":{\"traefikdomaintld\":{\"entryPoints\":[\"https\"],\"middlewares\":[\"traefikdomaintld-basicauth@consulcatalog\",\"traefikdomaintld-headers@consulcatalog\"],\"service\":\"api@internal\",\"rule\":\"Host(`traefik.traccar.domain.tld`)\",\"tls\":{\"options\":\"mintls12@file\",\"certResolver\":\"myresolver\"}}},\"services\":{\"traefik\":{\"loadBalancer\":{\"servers\":[{\"url\":\"https://xxxx:443\"}],\"passHostHeader\":true,\"serversTransport\":\"tls-default-dc1-traefik\"}}},\"middlewares\":{\"traefikdomaintld\":{\"redirectScheme\":{\"scheme\":\"https\",\"permanent\":true}},\"traefikdomaintld-basicauth\":{\"basicAuth\":{\"users\":[\"xxxxx\"]}},\"traefikdomaintld-headers\":{\"headers\":{\"customResponseHeaders\":{\"Strict-Transport-Security\":\"max-age=63072000\",\"X-Robots-Tag\":\"all\"},\"accessControlMaxAge\":15552000,\"stsSeconds\":31536000,\"stsIncludeSubdomains\":true,\"stsPreload\":true,\"forceSTSHeader\":true,\"frameDeny\":true,\"customFrameOptionsValue\":\"SAMEORIGIN\",\"contentTypeNosniff\":true,\"browserXssFilter\":true}}},\"serversTransports\":{\"tls-default-dc1-traefik\":{\"serverName\":\"default-dc1-traefik\",\"insecureSkipVerify\":true,\"peerCertURI\":\"spiffe:///ns/default/dc/dc1/svc/traefik\"}}},\"tcp\":{},\"udp\":{}}" providerName=consulcatalog
But the scheme is still https, are you sure that the traefik.consulcatalog.connect=false tag is added to the Traccar service?