LinkedIn Sales Navigator

I had an existing subscription to LinkedIn Premium that was managed via my iTunes/Apple account. Earlier today I added an additional subscription to LinkedIn Sales Navigator. However, when attempting to log into Sales Navigator via either the native app or web browser, I am running into errors related to the iTunes/Apple account management.

I have attached screenshots of the app error message, web error message, and confirmation of active Sales Navigator subscription.

Would appreciate any help or guidance you may have here. I have submitted a similar ticket to LinkedIn support as well.