Unable to “Login with Infusionsoft” for private app

Hi there

I’m trying to connect our Infusionsoft account but it’s not possible unless I choose “Use shared Infusionsoft developer app”. If I try to login after choosing “Use OWN Infusionsoft developer app” and hitting “save changes”, I get an alert saying “Infusionsoft Client ID Changed. Please save new changes first” even though I have already saved changes.

Any idea how I can get this connected without using the shared app please?

thanks
Martin