I can't sign in

Most Canto sign-in failures come down to one of four things: the email is registered with a different provider, a wrong password, an expired sign-in link, or (on the web) a blocked popup. Each has a specific fix below.

"That email is already registered with a different sign-in method."

You created your account with one provider — say Google — and are now trying another, like Apple or Microsoft, on the same email. Canto keeps one account per email, so the second provider can't create a parallel account.

The fix: sign in the way you did originally. On the web, the message spells this out — for example "This email is already registered with another provider. Sign in the way you did before and we'll link Microsoft to your account." After that one successful sign-in, Canto links the new provider to your account, and both methods work from then on.

Not sure which provider you used first? Try Continue with Google and Sign in with Apple in turn — the one that signs you in without an error is the original.

Wrong email or password

"Incorrect email or password." means exactly that — check for typos and a stray autofill entry first. If you see "Too many attempts. Try again in a moment.", wait a minute before retrying; the account isn't locked, sign-in is temporarily rate-limited.

There is currently no self-serve password reset in the app. If you've lost the password for an email-and-password account, contact support from that email address. If your email is also registered with Google or Apple, signing in with that provider gets you into the same account immediately.

"This sign-in link is invalid or has expired."

Email sign-in links (web) are single-use and time-limited. If the link errors:

1. Request or trigger a fresh link and use the newest email — older links stop working once a new one is issued.
2. Open the link in the browser you use for Canto, not inside your mail app's built-in browser.
3. If the page asks you to "Confirm your email address to finish signing in.", type the same address the link was sent to.

"Your browser blocked the popup — allow popups for Canto and try again."

Apple, Google, and Microsoft sign-in on the web open a popup window. If your browser or an extension blocks it:

1. Allow popups for Canto's domain in your browser's site settings (usually via the icon in the address bar).
2. Pause aggressive content blockers for the site.
3. Try again — the popup must open in direct response to your click, so click the sign-in button afresh rather than reloading.

Private/incognito windows with strict tracking protection can also break the popup flow; a normal window is the quickest test.

Still stuck?

• "No connection. Check your network and try again." — the device is offline or a firewall is blocking Firebase authentication; try another network.
• "Sign-in failed. Please try again." with no pattern — restart the app or hard-refresh the tab, then retry.
• Otherwise, reach out via the support page with the exact error text and the platform you're on.