Judging by the location of rot, it looks like the junction was contaminated when the graft was done. If there is enough viable scion(and depending on location), you maybe able to run out and grab a grandi hybrid and regraft it. You may also be able to cut the rootstock way down past the rot and try on the same.
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https://preview.redd.it/avou5heb0mwb1.jpeg?width=2268&format=pjpg&auto=webp&s=e971cc80b9f9f8d8538d4ceb8545e34dca2f3582
Follow up: the Scion is rotten :’(
Judging by the location of rot, it looks like the junction was contaminated when the graft was done. If there is enough viable scion(and depending on location), you maybe able to run out and grab a grandi hybrid and regraft it. You may also be able to cut the rootstock way down past the rot and try on the same.