I have some ideas if the immobilizer system were Hondas, but I think GM did that too (your fob is a GM key, right?) So, maybe a GM owner with personalized driver keys can chime in. I'd check your manual, some vehicles require to to do a lock/unlock sequence with the fob when set to the desired driver profile to link.
Thank you, I might have to open the owners manual to figure that out. Also a few emojis/icons on the dash that I'm not 100% what they mean that I'll have to research in there! It is a 100% GM system with GM fobs with a Honda logo stuck on haha.