If a page is noindexed, but includes a meta reference to an AMP version, is this a mixed signal?

Is the AMP version checked to see if it’s noindexed as well? Are there situations where you would want to index the AMP version but not the desktop version? Is Google even willing to index an alternate version of a URL when the primary version is noindexed?

Not sure if it was the right call or not, but instead of noindexing the AMP version of noindexed desktop pages, I instead removed the AMP version of noindexed pages completely, such that they now 404.

And, hours later, made another change. I’m 301 redirecting to non-AMP versions instead of 404’ing.

I wish there was a definitive answer on what to do here.

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