I just tested it with my Apollo nodes and was able to reproduce the same issue. It looks like Apollo isn’t returning email data for some contacts ( since this data is missing with the provider), which is why you’re seeing email_not_unlocked@domain.com in the results.
As a workaround, you can try using the Enrich Contact Information node in your library. It includes other enrichment providers (like Hunter.io, EnrichLayer, and ZoomInfo) and it should help fetch the missing email addresses.
Alternatively, you can still use the Apollo node to get general contact info, then pass the LinkedIn URL of the person and domain into the Enrich Company Info node. I tested this setup with your inputs, and it successfully returned valid email addresses.