EmileG wrote: token table only contain about 20 entries with names created in 2018
Are you the only person access this LimeSurvey installation? Did you create the tokenlist in 2018?
To me it looks like the old token list was replaced with a new one.
Try to fill out the survey with a dummy token and check if the name is added to the responses.
That way you can check if your LS installation did save the name in the survey responses.
Since you have no names in the responses and the tokenlist, you have no data available via LS.
If the tokenlist was replaced you might find the old tokenlist in the database.
But you need to access the database via a third-party tool.