I installed the free version of one calendar & paid £4.99 for the premium version via pay pal and am told now that I have the above problem, you don't have an account with either of my 2 email addresses. Where has my £4.99p gone? 

At least on my phone Galaxy S24 Ultra and One UI 7 the reminders are easy to miss. It would be awesome if they could be more similar to an clock alarm that rings and that I have to dismiss manually. I just missed a meeting while the phone is just 30 centimeters in front of my face.