I don't know if this is an ongoing issue. My recollection is that I just had to recreate the entire Flow and try again. I don't believe that I ever understood what was wrong with the Flow that would not register, so I cannot try to reproduce to test.
I have just experienced this problem again. I have a quite complex Flow for an approval process that was all working and now it just won't start from my PowerApp. It started coming up with a runtime error "trigger is not enabled" which I have not been able to find any information about.
I then removed the Flow from my app and now I have the dreaded "Failed to Register Service" error when I try to register the Flow again.
Please advise what steps I can take to try to fix this? I see other posts here talking about the problem being with the auto generated JSON schema. Can anyone help me with looking at this?
We are having the same issues with registering our Flows here... What I have found is if you have different connections, we have multiple people using their own connections while building, the service will not register. Once the connections in Flow have been changed to person registering the Flow in PowerApps, everything registers correctly.
Exporting and re-importing a Flow will request access to a connection when you open the Flow up, hence re-establishing the connection to the logged in user.
Mannually - Make sure to change the connection in each step of the Flow to the person who is registering the Flow in PowerApps, save the Flow, refresh PowerApps, connect the Flow to the item in your PowerApp, everything should register correctly.
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