'Calling Workflows from Scheduler

I have following schedule config:

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And SA has following roles: enter image description here

But getting error that it is not able to authenticate. Any thoughts what could be issue?

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Solution 1:[1]

For googleapis.com endpoints, you want OAuth rather than OIDC authentication. Note you can add Scheduler triggers in the Workflows UI, which is somewhat simpler, as it sets these values for you, and also formats arguments as required.

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Source: Stack Overflow

Solution Source
Solution 1 Kris Braun