Agent Authorisation postcode regex incorrect

[ddaddy]

The Agent Authorisation API's Get Status of a Relationship endpoint takes a knownFact param which is the clients postalCode.

It's regex pattern is ^([A-Za-z][A-Za-z]\d\d|[A-Za-z][A-Za-z]\d|[A-Za-z]\d|[A-Za-z]\d\d|[A-Za-z]\d[A-Za-z]|[A-Za-z]{2}\d[A-Za-z]) {0,1}\d[A-Za-z]{2}$ which clearly shows it accepts lowercase letters.

However if I submit the postcode a11 1aa it returns a 400 Bad Request with POSTCODE_FORMAT_INVALID

Whereas A11 1AA is successfully accepted.