Hello!
I would like to know which are the most restrictive rights to be given for the users in order to initiate an action in tempo. Granting the viewer one for the process model and the application is mandatory?
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The most restrictive rights assignment on process models is 'initiator'. You can find more information about process security and process model security on the following two links:
https://docs.appian.com/suite/help/17.3/Configuring_Process_Model_Security.html
https://docs.appian.com/suite/help/17.3/Configuring_Process_Security.html