I purchased the Pro Version through my iPhone and it now works fine on my iPhone, however on my iPad I cannot make it work, when I go to purchase Pro version the wheel is spinning endlessly, I tried numerous times with no success, Additionally I synched the iPhone and during the trial version my iPad through the iCloud and the did work fine..
FYI I checked the other relevant threads for the iOS Devices!
Diarium version: 3.1.11
OS + version: 18.2.1 (both iOS devices)
Device model: iPad 7th gen, iPhone13 Pro Max