When performing 'Forgot password' flow, 'AccountName' provided is case-sensitive and if the user does not provide the account name in exact similar cases, the user gets below error message:
"The information provided is invalid. Please try again."Image description
For example, if AccountName stored in 'AccountName', you cannot perform 'Forgot Password' flow user accountnames such as:
ACCOUNTNAME, accountname, Accountname. It has to be AccountName.
However, it is not same experience when doing standard login, as the UserName field on login screen is case insensitive.