u/Any_Worldliness_9500

I used to play on my Iphone 13 Pro Max when I had upgraded to my Iphone 17 Pro Max on the 28th of October, and since then ive been dealing with this problem. Ive tried just about everything i could think of including going back to old ios backups and no luck.
I had set up my account to be linked with Bandai and Gmail sign in given the fact that Facebook linking was no longer going to be possible. Gmail linkage was also confirmed by Bandai themselves.
After I had transfered everything from one device to the other it had not let me login even after confirming my gmail was infact linked. I only have one account, nor do i unfortunately have access to my 13PM.
Any help or tips would be super solid.