}
        return value;
    }

    /**
     * Gets the Entra ID authority URL from configuration.
     * Uses new entraid.authority key with fallback to legacy aad.authority.
     * @return The authority URL.
     */
    protected String getAuthority() {
        String value = ComponentUtil.getFessConfig().getSystemProperty(ENTRAID_AUTHORITY);

        <match value="45" type="string" offset="20">
          <!-- bibliographic -->
          <match value="[acdnp][acdefgijkmoprt][abcdims]" type="regex" offset="5"/>
          <!-- authority-->
          <match value="[acdnosx]z" type="regex" offset="5"/>
          <!-- holdings -->
          <match value="[cdn][uvxy]" type="regex" offset="5"/>
          <!-- classification -->