E2556 Invalid Universal Character Name '\%s' (C++)

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Source code contains invalid universal-character-name (UCN).

An invalid UCN character is:

• outside of valid UNICODE code point (0 - 0xD7FF, 0xE000 - 0x10FFFF).

Characters between 0xD800 and 0xDFFF are reserved for a surrogate code point.

Example:

 const char32_t c1 = U'\U3456789A'; // error: E2556 - 0x3456789A is outside of UNICODE. 
 const char32_t c2 = U'\U0000D801'; // error: E2556 - 0xD801 is not valid Unicode character.