Hola Carlos
Lo primero muchísimas gracias por tu respuesta y disculpa el tardar en contestar pues este fin de semana me ha sido imposible ponerme con la web.
Te cuento... seleccioné uno por uno cada Quiz, edité sus ajustes y cambié la opción de "Mostrar la actividad como completada cuando se cumplan las condiciones" por la de "No indicar finalización de la actividad". A cada modificación le di a guardar y observé que la casilla de check del seguimiento de finalización al lado de cada Quiz se quitaba...
Una vez quitadas todas las volví a poner como estaban dando en cada una a guardar y volviendo a aparecer la casilla de check al lado de cada Quiz.
Salí del usuario Admin y entré como un usuario matriculado con role creado al efecto a partir del de estudiante llamado "catequizando en 1ª etapa" (no sé si quizás este sea el problema, en la configuración de los permisos de este role). Y ninguna casilla estaba marcada como completada
Me acordé que había leído en algún foro que lo de comprobar la finalización de las actividades lo realiza el cron de Moodle cada 10 minutos... así que le forcé a ejecutar el cron.php y te copio la parte de la comprobación que efectivamente hace:
Execute scheduled task: Calcular datos de finalización
... started 08:35:01. Current memory use 32.6MB.
Marking users as started
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Running completion_criteria_date->cron()
Running completion_criteria_activity->cron()
Running completion_criteria_duration->cron()
Running completion_criteria_grade->cron()
Running completion_criteria_course->cron()
Aggregating completions
Aggregating completions for user 28 in course 2
Aggregating completions for user 29 in course 2
Aggregating completions for user 30 in course 2
Aggregating completions for user 31 in course 2
Aggregating completions for user 32 in course 2
Aggregating completions for user 33 in course 2
Aggregating completions for user 34 in course 2
Aggregating completions for user 35 in course 2
Aggregating completions for user 36 in course 2
Aggregating completions for user 37 in course 2
Aggregating completions for user 38 in course 2
Aggregating completions for user 39 in course 2
Aggregating completions for user 40 in course 2
Aggregating completions for user 41 in course 2
Aggregating completions for user 42 in course 2
Aggregating completions for user 43 in course 2
Aggregating completions for user 44 in course 2
Aggregating completions for user 45 in course 2
Aggregating completions for user 46 in course 2
Aggregating completions for user 47 in course 2
Aggregating completions for user 48 in course 2
Aggregating completions for user 49 in course 2
Aggregating completions for user 50 in course 2
Aggregating completions for user 51 in course 2
Aggregating completions for user 52 in course 2
Aggregating completions for user 53 in course 2
Aggregating completions for user 54 in course 2
... used 466 dbqueries
... used 0.70951390266418 seconds
Scheduled task complete: Calcular datos de finalización
A pesar de eso sigue sin estar marcado el check como te muestro en captura adjunta.
Respecto a que los usuarios están matriculados en el curso el mismo Cron lo muestra.
Lo único que me queda pensar es que todavía se me escapa algo, que tenga algo que ver algún permiso del role o que algo hiciera mal al pasar del servidor a local la web pues al principio la instalé directamente en el servidor dado que no estaba en producción utilizando las mismas herramientas automáticas de instalación que el servidor me ofrecía... si bien todo en local me va bien y no me señala ningún error.
No sé si se te ocurre algo más que pudiera ser o que esté haciendo mal... de todos modos muchísimas gracias por tu respuesta.