It is not mandatory and your Tawaf is valid even if you didn’t do that. If there is no crowed, it is sunnah to kiss it. If you are not able, simply point at it.

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Before assuming Ihram while in the plane over the meeqat, she must say the talbiyah and make a condition that if she was preferred from completing her Umrah, she may take of her Ihram without any expiation. https://islamqa.info/en/111784

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Any Muslim can perform hajj on behalf a deceased person even if they are not related.

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