Usage:
I have an 2 accounts (cards) with an external provider. Using Monzo Plus, I can add more than one account from a different provider at a time, keeping track of multiple cards.
Ideal:
I can add multiple accounts from an external provider.
Current:
I cannot add multiple accounts to a single provider. Attempting to do so replaces the one already added.
If it’s a Capital One card (two cards, one login), it’s a known issue that they need to fix I believe.
If you’re talking about multiple logins with the same bank than that’s more of a Monzo thing to consider.
Cheers @Feathers my case scenario is Capital One - hoping for a fix soon !
I think you may need to talk to Capital One themselves to ensure that.
Would also like to do this with Revolut. Have a Revolut business and personal account but can only add 1.
Same issue with Capital One here, still persists. Capital One does cobranding credit cards. I have multiple but can only have a single one linked at a time. When I try to link another one the original het’s replaced 
Hope it get’s fixed
I think this is an external issue. I can add two MBNA cards but I can only add one Starling account.