Cannot access wp-admin with new domain

Hello guys. I have a website that I am using to recruit staff and it’s still in its early stages.

Initially i bought a domain and hosting with godaddy.

Recently i bought a new domain (still with godaddy) and wanted this to be primary for my support staff.

With the old url that was bought with the hosting i can access everything ok but with the new domain I cannot access wp-admin

Is there anything I can do? I plan to allow the old domain to expire and just use the new one.

Kinda regards, Mikey.