Delete lost phone from Garmin Connect

I've replaced my lost phone, but my Garmin Fenix 7 still thinks the lost phone is the main one.  I've set up Garmin Connect on the new phone, and it works fine...but Find My Phone etc is still associated with the old phone. 

The phones aren't listed as associated devices on the Garmin app, so I can't remove them manually.

Can anyone help? Thanks