public Set<DeviceType> getConflictedDeviceTypes(
            @NotNull @ValidDeviceType DeviceType deviceType) {
        return deviceTypeToExclusiveDeviceTypes.get(deviceType);
    }
Forbidden device types can never connect to turms servers
turms-gateway/src/main/java/im/turms/gateway/domain/session/service/UserSimultaneousLoginService.java