It used to be that "I can't sign in" meant one app. Now you're juggling four or five AI tools — ChatGPT, Claude, Microsoft Copilot, Gemini, maybe Perplexity — and every one of them has its own sign-in quirks. The good news: across all of them, the failure modes are basically the same six things. Once you know the order to try them in, most sign-in problems take less than ten minutes.
Step zero: read the exact error wording
This sounds obvious and almost everyone skips it. The screen tells you which fix you need. A short reference:
- "That account doesn't exist" → wrong identity type (Fix 1) or you typed it wrong.
- "Too many attempts" or "Please try again later" → rate-limit lockout (Fix 5).
- "Service not available in your country" → region block (Fix 4).
- "Verify it's you" or a code prompt → MFA (Fix 3).
- The page reloads itself and never finishes → browser cookies (Fix 2).
- "Your organization needs to approve this app" → SSO / Conditional Access (Fix 6).
Match the wording to a fix and skip straight to it. The order below is the order to use when you're not sure.
Fix 1: Sign in with the right account type
Most AI tools accept several identity types. Picking the wrong one looks identical to a wrong password — except the password is fine.
- ChatGPT at
chat.openai.comaccepts OpenAI accounts, Google, Microsoft, and Apple. Whatever you used to create the account is the only one that signs you back in. "Continue with Google" does not also work if you signed up with email. - Claude.ai accepts Google, email + password, or SSO for Team/Enterprise users. The same email signed up with Google won't sign in with email + password.
- Microsoft Copilot is the trap.
copilot.microsoft.comwants a personal Microsoft Account;m365.cloud.microsoftand Copilot in Office apps want a work or school account. Same email can host both. See the Copilot guide for the full breakdown. - Gemini at
gemini.google.comwants a Google account; if you're signed into multiple, the "wrong one" is selected by default.
If you're not sure which sign-up method you used, look at your inbox for the original welcome email — it almost always says "You signed up with...".
Fix 2: The incognito-window test
Stale browser cookies cause more AI sign-in failures than anything else, and the symptom is sneaky — the page accepts your password, redirects, then bounces you straight back to the sign-in screen. Test it in 30 seconds:
- Open a new private / incognito window.
- Navigate to the sign-in URL (not from a bookmark — type it).
- Sign in.
If it works in incognito but fails in your normal browser, the regular browser's cookies for that domain are bad. Clear cookies for the specific site and try again. In Chrome/Edge: Settings → Privacy → Cookies and other site data → See all site data → search the domain → delete. Don't clear all cookies — you only need that one site.
Fix 3: Get past the MFA prompt
Two-factor problems on AI tools have three flavors:
- The code never arrives. SMS throttling, mostly. Wait 90 seconds, then click "Resend." If you have an authenticator app set up, switch to that — it always works.
- The code arrives but gets rejected. Your phone's clock has drifted. In Microsoft Authenticator or Google Authenticator, look for "Time correction" or "Sync time" and run it. The next generated code will be valid.
- You don't have access to the second factor anymore. Different recovery paths per tool — OpenAI uses
help.openai.com's account-recovery form, Anthropic usessupport.anthropic.com, Microsoft usesaccount.live.com/acsr. Plan for a 24–72 hour wait.
Fix 4: Check for a region block
AI services are still gated by country. The list changes month to month, but as of 2026 the patterns to watch for:
- OpenAI blocks based on the billing address tied to your account and on the IP at sign-in time. Traveling to a blocked region while signed in is enough to trigger a session lock.
- Anthropic blocks at the API level and the web level by IP geolocation.
- Gemini rolls out features by country; your account works, but a feature you saw a colleague use isn't visible.
- Microsoft Copilot is the most globally available, but Copilot Pro purchase isn't.
If you suspect a region block, do not "fix" it with a VPN. AI providers actively detect commercial VPNs and treat the connection as a policy violation. A VPN-flagged sign-in often turns into an account lock — see how to recover from that. If you're genuinely in an unsupported country, the only legitimate path is to wait for official rollout or use a sanctioned alternative.
Fix 5: You've hit a rate-limit lockout
Rapid retries — refreshing the page, typing the password three times, opening the app five times in a row — trigger a temporary sign-in throttle. Symptoms:
- The button responds but nothing visible happens for several seconds, then fails.
- "Too many attempts. Try again later."
- A CAPTCHA that appears, gets solved, and immediately re-appears.
The fix is the same everywhere: stop. Wait 15 minutes without any retries. Don't reload the page during the wait — every reload extends the timer. After the wait, sign in once, deliberately, with the password from your password manager.
Fix 6: SSO and Conditional Access blocks (work accounts only)
If you're using an AI tool with your work email and getting "Your organization needs to approve this application" or "Sign-in blocked by Conditional Access," your sign-in is reaching your company's identity provider and being denied there. This is not something you can fix on the AI tool side. The path:
- Take a screenshot of the exact error including any error codes (look for "AADSTS" followed by numbers — Microsoft tenants).
- Send it to your IT helpdesk with: "Trying to sign into [tool name] with my work account. Getting the attached error."
- Be prepared for IT to need a few business days — they may need to approve the tool in their identity provider's app gallery.
If you don't have time to wait, sign in with a personal account instead. Just remember: anything you put into a tool signed in with a personal account is not on your employer's data plan.
Quick-reference card
- Wrong password three times in a row? Stop and wait 15 minutes — Fix 5.
- Sign-in page loops without an error? Incognito test — Fix 2.
- Code never arrives? Switch to authenticator — Fix 3.
- "Account doesn't exist"? Wrong sign-in method — Fix 1.
- Just landed in a new country? Region block, not VPN — Fix 4.
- Work email, organization message? IT, not you — Fix 6.
Save the link to this page. The next time an AI tool refuses to let you in, you'll have the answer in two minutes — and you won't be the third person at your office that morning asking IT for help with something they can fix themselves.