Cannot log in for the first time

hi everyone, I have a problem:
I can’t log in with admin credentials in the web interface for the first time … I installed nextcloud on raspberry pi4 with dietpi and connected to the available web interface by typing the IP address of the device, but when I try to log in states that the default credentials “admin” and “Nethesis, 1234”
I attach below the photo

Are you posting to #apps:suspiciouslogin because that has something to do with your issue?

Check the DietPi documentation if that is what you are using for installation.