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Why can’t I access wp-admin for my WordPress fresh install via Softaculous?

Please help me, I’m a beginner WordPress developer. Here’s the backstory.

The domain’s registrar is IONOS then this domain was connected to Appdrag where the website was built. My client wants to transfer the website to WordPress so what I did was, reset the domain in IONOS to remove all the changes in DNS records then, added the nameservers of Namecheap where he wants this domain to be hosted. I also deleted the domain in Appdrag just to lose any connections. Then, added the domain to cPanel as an addon domain then installed WordPress via Softaculous. The installation went well but when I access wp-admin, I only see a white screen, not the login screen.

Are there missing DNS records that I need to add in the cPanel Zone editor?

Thank you in advance.