Not all UPI apps or banks support IPO applications through the UPI route. The National Payments Corporation of India (NPCI) has approved only a select list of UPI apps and banks for IPO-related payments. 

If your UPI handle (e.g., yourname@xyzbank or yourname@upi) belongs to an app or bank that is not authorized by NPCI for IPO transactions, it will not be accepted during the application process.

This limitation is in place to ensure secure and seamless processing of IPO mandates and payments.

Here’s what you can do:

1. Check if your UPI handle is supported: Visit the NPCI’s official list of live IPO UPI partners here: NPCI Live IPO UPI Apps and Banks
2. Use a supported UPI app or bank: If your current UPI handle is not listed, you can switch to a supported UPI app (like PhonePe, Paytm, Google Pay, etc.) and link it with a bank that is IPO-enabled.
3. Re-link your UPI handle in the IPO application process using one from the approved list.

If your UPI is from a supported provider but you’re still facing issues, it could be due to:

• Technical downtime or configuration issues from the bank’s end.
• Incorrectly entered UPI ID.
• The app is not being updated to the latest version.