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Beta ROMs are not certified in PlayStore. But it won't make any issue with your normal usage though. All apps will be downloaded properly and will work normally.
You can also read the explanation and check the methods mentioned in comment #7 (pinned comment) to see if any of the methods work for you : https://c.mi.com/thread-2132170-1-0.html (Use a browser to open the thread - Mi Community app has issues opening links.)