Thanks everyone for your replies.
Good news, I was able to reregister Signal on my old phone. It seems I just couldn't see the Cancel and reregister option in the last step of the transfer on my old phone.
I then installed Google Framework and Services on another profile. I went back to my Owner profile and tried to reinstall Signal there using the apk file from the Signal website, and for some reason, this time it worked and I have my history. Not sure if installing the Google Framework on another profile had anything to do with it. I should have had to install it on the same profile for it to make a difference, no?
Both dc32f0cfe84def651e0e and the Aurora store have stated Signal requires GSF to work (unless I use the fork), so I'm not sure why it is working. Will I run into issues later?
I also tried installing Signal through the Aurora store that I installed on my Owner profile, but for some reason, when I searched the Aurora store for Signal, it didn't show up. Same happens when I search for Komoot. I'm guessing they don't show because they require GSF and I don't have it installed on that profile? Which brings me to the same question, how come Signal working when I don't have GSF on that profile? I'm still learning; sorry for the beginner questions.
Thanks again.