URGENT issue

Yesterday, I was trying to add the app to my MacBook and get them to sync. I noticed that the way I had signed in on my iPhone was through my Apple account, but I couldn't get it to let me login that way from my MacBook so I saw that you could change your email address and password so I did that on my iPhone for my account and then I tried to login on my MacBook doing that and it acted like I was a new user and then when I looked on my iPhone, it was showing the email address that I changed it to as if it was accepted, and I verified it via an email that was sent to me. Then this morning on my iPhone, it has logged me out and then it doesn't give me the option to like try and login. It just is asking me to either get a subscription or restore. I can't go to any other page but that page and if I click restore, it said there's no subscription found. But I pay for the annual subscription and it shows that in my settings on my iPhone. Can you help me figure out how to fix this so I can login and my subscription is working and my beta testing is working and I can use this on my computer and my iPhone. I feel lost without this because it helps me so much daily to manage my time as someone with ADHD. lol