OIDC isn't supported at this moment. You can use scopes instead of permit/deny all. Also checkout this newly added support for code, which will probably not solve the problem but may help in some specific cases.
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That's a shame. Is it in the pipeline?
I am assuming you are asking whether custom script feature is in the pipeline or not. Custom script feature is in public preview.
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No, I'm wondering whether OIDC is in the pipeline
I am not aware of this feature in the pipeline. You can submit your ideas here: https://powerusers.microsoft.com/t5/Power-Automate-Ideas/idb-p/MPAIdeas
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