You may try opening the Brainly website using your browser's incognito mode. In other words,
Go to the Brainly website on Incognito mode > click Join and then follow the process to create an account.
However, if the issue persists you may then click the Contact Us button on the Homepage of the website and fill the accompanying form to send in your complaints.
since the app are two different things its crucial to have a activision account, though the progress wont be reset unless you do have an activision account
