The claim that Sephora has illegally donated funds to Trump's campaign is false. Like you state in your claim, corporations are not allowed to use general revenue to fund a political campaigns, which many social media users on multiple platforms claimed Sephora was guilty of. The conglomerate that owns Sephora, LVMH, has had affiliates who have legally donated to campaigns during the 2024 election. Luckily for us, this is public information as the FEC requires donations greater than $100 must be reported to the public. In this past election, LVMH amassed $78,601 from individual donors. Affiliates of Sephora -specifically- donated $25,481 to Democratic causes, and only $1,008 to Republicans. Not only was this all completely legal, but over 95% of the donations were sent to Democratic causes.
All claims that I could find of the statement that Sephora donated large sums to the Trump campaign come from social media posts that don't have any source or context attached. Though the claim was viewed more than 13 million times on TikTok and spread around the website, none of the claims I could find had any evidence to them.