CAT 2025 Registration Faces OTP Validation Issues; Here's How to Fix It

CAT 2025 aspirants are facing issues with OTP validation during CAT 2025 registration. Many candidates reported that the OTP was delayed, invalid, or not delivered on time during registration on the official website – iimcat.ac.in. With over 3 lakh candidates expected to register for CAT 2025, this glitch has raised concerns. The OTP error message says: 

Tried to validate OTP for which OTP is not generated in the current session.

• CAT 2025 registration is open from August 1 to September 13, 2025, on the CAT official website.
• CAT aspirants are reporting delayed or invalid OTP during the registration process.
• Issues with OTP during CAT registration may be due to heavy traffic and server overload or technical glitches on the candidate’s device.
• Try alternale email ID/mobile number, use compatible browser and internet connection, avoid peak hours, and retry after sometime to avoid the CAT registration OTP issues.

What is CAT OTP?

OTP stands for One Time Password. It is sent to your registered mobile number or email ID during Common Admission Test (CAT) registration. The CAT OTP is a six-digit code essential for verifying the mobile number or email ID and authenticating the registration. The OTP remains valid only for a specific time limit. 

Issue with OTP Validation during CAT 2025 Registration

Candidates are facing some CAT OTP 2025 issues during registration. They took to social media platforms like Reddit and X to share their concerns. Here are the top complaints:

• OTP not sent to the registered mobile number or email ID after repeated attempts
• OTP delivered after a long delay, when the code has expired
• Issues with OTP validation, even when entered correctly

How to Fix CAT 2025 Registration OTP Issue?

Experts suggest that these issues with OTP during CAT registration are due to server overload and heavy traffic. Here are few tips to resolve the CAT OTP issues:

• Verify Email ID and Mobile Number: Make sure you have entered the correct, active, and valid email ID and mobile number during registration. 
• Check Browser Compatibility: Use only compatible browsers in the correct version for CAT registration.
  • Browser: Mozilla (122 to 141), Google Chrome (114 to 138), or Microsoft Edge (114 to 137) 
  • Phone:  Android (version 4.0 and above) and iOS (version 11 and above)
• Use Stable Internet: Make sure you have a stable, strong, and high speed mobile signal and internet. Switch to 4G/5G or Wi-Fi for CAT registration. Slow network often delays OTP delivery.
• Clear Browser Cache, Cookies, Browsing History: Old cache may block the CAT OTP submission. Here are some troubleshooting tips:
  • Use Incognito/Private mode
  • Switch to a different browser (Mozilla, Google Chrome, Edge)
  • Update browser and try again
  • Log out and re-login to the CAT registration portal
  • Restart your device and retry
• Use Alternate Mobile Number or Email ID: You can request for CAT registration OPT through valid email ID or mobile number. If OTP delivery fails via SMS, switch to email and vice-versa. If both options fail, then use a different email ID or mobile number.
• Wait and Retry after Some Time: CAT registration OTP maybe delayed due to heavy traffic. Wait for some time then relogin and click on ‘Resend OTP’. 
• Avoid Peak Hours: CAT 2025 registration portal faces heavy traffic in evening hours. Try using the portal early in the morning (7 AM to 9 AM) or late at night (10 PM to 12 AM) for better chances. 
• Disable SMS-blocking or DND Settings: Ensure there is no active SMS-blocking or Do-Not-Disturb settings on your device that may prevent receiveing CAT OTP SMS. 
• Check Email Spam/Junk Folder: CAT OTP may end up in the Spam or Promotions folder. Search for ‘CAT OTP’ in your inbox to check if you have missed the mail. 
• Contact CAT Helpdesk: If the issue persists, reach out to the CAT support

CAT 2025 Registration Complaints

Over the years, candidate face similar OTP-related problems during CAT registration. Many reported that the OTP was either not delivered or delivered too late, while the correct OTP was marked invalid. 

Here are some concerns raise by Reddit users:

“OTP not validating in CAT registration
what’s wrong with the site?? been trying for an hour, but this message keeps popping up whenever I validate the OTP. Anyone dealing with the same?”

Another user wrote:

“Email OTP not received in CAT registration. 

I'm I the only one?!

Update: Mail came, but around 30 mins later. Most likely because of high traffic for registrations.”

This is what another Reddit user had to say last year:

“Issue with OTP Validation During CAT Exam Registration

I'm trying to register for the CAT exam, but I'm getting stuck on the mobile and email verification step. I keep getting this error: "Tried to validate OTP for which OTP is not generated in the current session."

I've tried multiple times, but the issue persists. Has anyone else faced this problem or knows how to fix it? Any help would be appreciated!”

Reasons for CAT 2025 Registration OTP Issues

• Heavy traffic on the CAT portal
• SMS/Email gateway faces temporary overload with lakhs of candidates trying to access it at the same time.
• Expired OTP or session
• Browser cache issues or technical glitch on candidate’s end
• Email/SMS blockers and filters active on device

CAT 2025 Common OTP Issues and Troubleshooting Tips

Here are the most reported CAT OTP-related issues, their probable causes, and suggested solutions: