I had the same problem recently where previously Google Play Store worked fine with 1-Tap and fingerprint authentication and then it went back to asking for my Google password every time for no apparent reason or changes to my Note 9 device. So...I went into my Samsung device's settings page -> Biometrics and Security -> Biometric Preferences -> Preferred Biometric and changed from Face Recognition to Fingerprints. That fixed it for me. I didn't have to delete all my fingerprints.
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