If you have SECN you can watch SECN+ free, you don't need an ESPN+ paid subscription..........
https://www.secsports.com/article/11130708/about-sec-network-sec-network+Q: ESPN+ is a paid subscription. Do I have to pay separately to access SEC Network+?
A: No. SEC Network+ is complementary to SEC Network and part of your subscription with your cable, satellite, or streaming provider. Q: If a game is on ESPN+ or SEC Network+, can I watch it on TV? A: SEC Network+ and ESPN+ are not television channels, but they are available via the ESPN App on your TV through connected streaming services and devices. Q: Will the games on SEC Network+ and ESPN+ look any different? A: These games will have the same production value as games across all ESPN networks. For games airing simultaneously on SEC Network+ and ESPN+, both feeds will have the same on-air commentators and game coverage.