If you see an 'Authentication Error' when signing in to Dapple, the cause is almost always one of two things: you're following an old sign-in link, or you're already signed into a different Dapple account in another browser tab. Use the most recent sign-in link from your inbox and sign out of any other open accounts. If that doesn't fix it, clear your browser cache or try an incognito window.
Common causes
Cause | Why it triggers the error |
Old sign-in link | Every new sign-in link expires the previous one. Clicking an older link shows 'no longer valid'. |
Signed in elsewhere | If you're already signed into another Dapple account (in a different tab or browser), the new sign-in conflicts. |
Cached old session | Browser cache can hold stale authentication state. |
Wrong email address | Trying to sign in with an email that doesn't match the invitation or account. |
Fix 1: Use the most recent sign-in link
Every time you request a sign-in link, Dapple invalidates the previous one. So an older email's link will fail with this error.
Go to app.dapplehq.com and choose the email sign-in option.
Enter your email and request a new sign-in link.
Open your inbox and look for the most recent email from Dapple.
Search for 'Dapple' to surface it, and check spam/junk if needed.
Open that email and click the link inside — it's the only valid one.
If the email displays with the three-dot menu collapsed, click the dots to reveal the full email body including the link.
Fix 2: Sign out of any other Dapple accounts
Check every browser tab and window — are you signed into Dapple anywhere else?
If yes, click your profile picture/initials in the top-right.
Choose Sign Out.
This signs you out of all Dapple accounts across this browser.
Now try the new sign-in link from scratch.
Fix 3: Clear your browser cache or use incognito
If the above don't work, the issue is likely cached authentication state:
Try an incognito or private window first (Chrome: Ctrl/Cmd + Shift + N; Safari: Cmd + Shift + N; Firefox: Ctrl/Cmd + Shift + P).
If that works, the issue is browser cache. Clear cache on your normal browser.
Sign in again with a fresh link.
Full instructions: How to Clear Your Browser Cache and Use Incognito Mode
Fix 4: Confirm the email address matches
If you were invited to an organisation, the email address used to invite you must match the address you sign in with. If the invite went to work@example.com but you signed in with personal@example.com, no account exists for the personal email.
Check the invitation email — the address it was sent to is the one to use for sign-in.
Still not working?
If all four fixes fail, contact support with:
Your email address.
The exact error message you're seeing.
The browser and operating system you're using.
Which of the above fixes you've already tried.
We can dig in from there.