By mistake I created a duplicate "Mail" Notification Connector and can't delete it.

If I try to Edit the connectors it says that I can't do this without a subscription (or trial) but, as this is on a Microsoft Account and not a work or education accounts, I am unable to do the trial/get a subscription!
How can I delete this duplicate connection?
I only have the one (simple) flow so I could completely delete my PowerAutomate account (but not my whole Microsoft Account) as long as I was then able to create it again using the same Microsoft Account 🙂