I’ve been facing the exact same issue, any insight on how to fix it.
update: I’ve been able to solve this on brave with this by disabling the auto-redirect AMP pages under the shields as listed here: https://wordpress.org/support/topic/cant-install-sitekit-bad-request-missing-parameter-code-2/
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This reply was modified 3 years, 10 months ago by astroajay. Reason: Solved