Action "GenerateGuid":

Just call it. And it returns GUID, e.g. 'cb29bcae-4409-4ffd-a5d2-7fbc6d9af856 '

Action "GenerateFormattedGUID":

In this action to generate a GUID you need to provide the format specifier. Check information below the image. But possible values are: N, D, B, P, X.

Example of input:

FormatSpecifier: "N"

Output:

GUID: "366ff74b27aa4b41add315709f088b97"

Possible formats (image from Microsoft docs):

Action 'GenerateFormattedGUIDfromString':

This action returns a GUID base on a GUID string provided and it's specifier format.

example of input:

FormatSpecifier: "N"

StringGUID: "366ff74b27aa4b41add315709f088b97"

Output: 

GUID: "366ff74b-27aa-4b41-add3-15709f088b97"