>>> What team other then Texan Longhorn accept an invitation to the SEC in July 2021? 

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Based on the context provided, the only other team from outside the SEC that accepted an invitation to join the conference was Oklahoma. The information states that after Texas and Oklahoma accepted their invitations to join the SEC, the Big 12 announced that the two schools had negotiated a combined $100 million early termination fee in order to leave for the SEC a year before the schools' media rights deal with the Big 12 was set to expire. This implies that the Big 12 was losing two of its most prominent members, and the context does not mention any other team from outside the SEC accepting an invitation to join the conference at that time.