There can  be issues if you made a mistake in your UID (Unique Identification Aadhaar) while registering for the Diploma CET (Common Entrance Test) and created a new account with different contact details.

Having two accounts with the exam authorities, even if due to a mistake, might be seen as a duplicate registration. This could lead to complications in processing your application or even disqualification. UID is often a primary identifier for entrance exams. A mismatch between the UID you used for registration and your actual UID could flag inconsistencies in your application.

Contact Exam Authorities: Get in touch with the Diploma CET exam authorities as soon as possible. Explain the situation clearly – that you made a mistake in your UID while registering and created a new account due to that error.

Contact Information: Look for the exam authority's contact details on the official Diploma CET website. This might include phone numbers, email addresses, or a contact form.

Provide Proof: Be prepared to furnish them with proof of your mistake. This could include screenshots showing the error in your initial registration and any confirmation emails you received for both accounts.

Request Correction: Request the exam authorities to consider correcting your UID in the original registration with the correct details.

Avoid Using Second Account: Do not use the second account you created with the different phone number and email. This could further complicate the situation.

I hope it helps!