Subscriber missing recipient details - even though the subscriber has the email address

Hi
I'm trying to send a notification via email to a group of subscribers, but I get the error "Subscriber missing recipient details" - even though I can clearly see that the subscriber has an email address in the db.

I think this may be a caching issue at Novu:

I had been migrating users from dev to prod, then sending them a message. but unfortunately for a bunch of the users, I tried to send the message before they had been migrated. So at that point the above error made sense. However, I've since correctly copied the users to the Production environment, but I get the same error as though they're not there.

Is this something anyone's had before/someone can look into ?
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