What does HRESULT 0x803100A4 (FVE_E_POLICY_PASSPHRASE_REQUIRES_ASCII) mean?

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Your system administrator requires that passwords contain only printable ASCII characters. This includes unaccented letters (A-Z, a-z), numbers (0-9), space, arithmetic signs, common punctuation, separators, and the following symbols: # $ & @ ^ _ ~ .

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FVE_E_POLICY_PASSPHRASE_REQUIRES_ASCII

FVE_E_POLICY_PASSPHRASE_REQUIRES_ASCII The proposed BitLocker password contains characters not permitted by effective policy. The policy requires printable ASCII characters, so accented, non-Latin, or other Unicode characters are rejected.

What to check

Use only the printable ASCII character set required by the policy.
Check password length and complexity as well, because satisfying the character-set restriction alone may not be enough.
If the limitation is no longer appropriate, have the policy owner change it rather than bypassing a managed rule.

manage-bde -protectors -get <drive>

Microsoft: Configure BitLocker policy settings

Microsoft: BitLocker FAQ

Microsoft: manage-bde -protectors

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