I have never heard of an instance of Harris attending and attempting to take part in communion in any orthodox Baptist churches. I have never even heard of Harris even attending church other than during the campaign.
Harris says both she and Joe are "proud people of faith" and "deeply spiritual persons" who believe in the bible and attend church regularly. Her home church is the Third Baptist Church of San Francisco, which she usually attends on Sundays. Her pastor, the Rev. Amos Brown, says she is good Baptist Christian and routinely gives her "the Lord's Supper, with no questions asked.
The reason you haven't heard about it is that the mainstream media LOVES to beat us over with the head with Joe Biden's Catholicism and CONSTANTLY talk about what a "good Catholic" he is, while completely ignoring Kamala's Harris religious "private life" to the point where 90% of Americans probably aren't even AWARE what religion she claims to be.
Same reason you frequently hear about Nancy Pelosi's Catholicism, but most people still haven't figured out "Rev." Ralph Warnock claims to be a "Evangelical" Protestant. It goes against the media's narrative (good Catholics love abortion and gay marriage, good Evangelicals love Trump), so they simply ignore it.