The following OAuth clients that you manage have been inactive for at least five months. They will be deleted unless you take action:

...list of client ids...

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Now, all of those client ids are used in production, so this seems like a false positive. There seems to be no way to prevent this except "using them" but we already use them so it seems like we're out of luck? But we are not the only one, I've found some similar posts on reddit.

I couldn't find a way to report this either, Google Cloud support is a maze and I either don't have some permissions for it or it redirects me to some support page or AI chatbot.