The NSS wrote to the Prince Charles and the Prince William last week to ask if they agree with Archbishop of Canterbury Justin Welby's affirmation of a Church resolution which said same sex marriage was wrong and "homosexual practices" are incompatible with scripture.
The NSS said that as future sovereigns, the Prince of Wales and the Duke of Cambridge will be "oath-bound to maintain and preserve the doctrine and worship of the Church of England".
But it highlighted that Prince William has previously spoken up for the rights of LGBT people.
In 2019 the duke told an LGBT youth charity he would "fully support" his children if they were gay, but would worry about the "discrimination that might come".
The NSS asked whether the duke agreed with the Church's stance and for his message to his "future gay, lesbian and bisexual subjects".
The British monarch, as well as being head of state, also holds the title 'Defender of the Faith and Supreme Governor of the Church of England'.
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