The app has a repeating UI/UX quirk where it won’t accept a typed username or password, resulting in a log-in error.
The solution: reinstall app (which you’ve done), add existing user, DO NOT TYPE USERNAME AND PASSWORD IN.
Instead, go to a separate NotePad (or similar) app, type your username and password on separate lines, then copy-paste them into the appropriate fields in the Zwift app.
100% of the time, this fixes the issue for me.
EDIT - if on a PC/Mac (not an iPad/AppleTV), you may have to delete whatever folders Zwift has left installed to completely remove all traces of your existing user profile.
From that screen, clicking “Add existing user” should yield a screen with BLANK fields. If not, either your system is auto-populating fields (no good) or your user profile is still saved on your system. You need to delete that from the system entirely. (not sure how do on Windows/Mac - I’m using a tablet that nukes all user data if uninstalling the app)
Glad you resolved it! You typed that just as I was typing a follow-up: indeed, the folder where Zwift was storing your user data needs to be removed or the newly reinstalled app will just keep trying to pull old profile data.
Great news that this worked for you, Ratna.
To help others find what worked thanks to @Otto_Destruct, you can select the most useful of his responses and tag it as ‘Solution’. That will add the relevant info just below your opening post.
It’s hard to say if the issue you encountered is a true Zwift bug or if it’s more an issue with macOS.
My first thought is that you’ve got the email and password stored in your keychain, which is an encrypted container that securely stores your account names and passwords on a Mac. I’m guessing you’ll need to clear Zwift data out of that, which generally takes more than deleting folders and re-installing Zwift.
For more information on managing your passwords using keychains on a Mac, please see this related Apple support article.
Same issue. I changed the password to something with special characters. Tried to log into companion and it was giving me the oops alert. FIX: Logged onto zwiftcom from my computer. changed password on the site to a password without special characters. That allowed me to log into the companion app.