Hello @kmacnz,
Thanks for sharing your question with the Klaviyo Community!
From my experience, it shouldn’t matter that your facebook accounts sits under the same user as your Klaviyo accounts. Both Klaviyo and Facebook supports multi-account access and should be able to manage users having multiple accounts access.
Since you are getting a “Klaviyo is no longer authorized to connect”, this typically indicates some sort of authentication issue pertaining to your permissions levels. To resolve this, I would recommend double checking your permissions on both Klaviyo and your Facebook backend to ensure you have the required authorization to make these connections. Once updated, you’ll want to fully remove the Facebook integration with Klaviyo and reintegrate it again with your Klaviyo account. It also helps to clear your cookies and cache and using an incognito browser to make these connection to make sure they aren't playing a role in this disconnection.
@Jessie Sigler also has a number of Community posts pertaining to troubleshooting Facebook integration issues and the steps to resolve them. I’ve included a directory to these post below:
I hope this helps!
David