Approvals are not triggering if non-itil users submits the request

[Yakshitha]

Using a flow designer for one of my catalog item. Approvals are not triggering if non-itil users submits the request. I have updated run as property to "System User" but in the flow context its still showing as run as username. Also in the RITM activities instead of System its showing username
@Ankur Bawiskar 

[Ankur Bawiskar]

@Yakshitha 

if admin raises the request then is it triggering approval?

what error it shows? share screenshots

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[Yakshitha]

@Ankur Bawiskar 
Yes if admin users raise the request approval are getting triggered.
Getting error as "The requested flow operation was prohibited by security rules"