Inflexible and frustrating date of birth input

Users affected
P1
Type of issue (10 usability heuristics)
Error prevention
Ease of fix
Easy
Outcome/Workaround
ABANDON: Unable to proceed without moderator prompting
Severity
Critical
USER EMOTION: Observation
FRUSTRATION: During registration, users try to key in their own preferred date format, and are unable to understand error message presented. Users do not notice the date format microcopy (YYYY-MM-DD). During OTP reset, users are given a calendar picker instead, causing frustration for users as they scroll through many months to find their DoB.
Feature(s) impacted
Registration
OTP