API - Inactive user

API - Inactive user

Hi 

We have a complex flow set up with an API. Yesterday I needed to inactivate a user who had set up the flow and API- realised after this, then broke the connection so - re-activated the user. The flow now seems not to work when gaining information from the external source with the API.

Can anyone help me to see if there is something I need to do to activate this, as the flow will reach 20 times of not working and switch off 

thanks
Kim