Google does not index my posts as amps

Google does not index my posts as amps, only a few are indexed as amps. is there a way to index all posts as amp? in my search console there only valid 14 posts as amp, but i have more than 14 post. i already test using amp tester tools providing by google all my posts have a valid version of amp. how to solve this? is it just need a time too google index all of my posts as amp?

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