WordPress login/register/DB-functions not working after move

Hi

I know little to nothing of WordPress, nor of Linux servers or AWS.
I’ve used various guides for moving an existing website from a managed hosting provider to AWS EC2 – such as

https://www.tecsolsoftware.com/blog/migrate-wordpress-website-aws-5-minutes/
I’ve got everything up and running server-wise.
Then I migrated the existing installation – I used the backupbuddy plugin to backup the databases, and moved the zip file to ec2.
I used FTP to download the entire file-structure and upload it to EC2.
I unzipped the DBbackup.zip file and used the
I created the DB wordpress
mysql -u root -p -h localhost wordpress < /var/www/html/(all the different .sql files here, like 30+ files)
I changed wp-config.php to point to the new wordpress DB (old name was something random) and changed also the password to the new password
I thought the problem was related to permalinks and created a blank htaccess

Now I’m simply stuck with a website that as such seems to work, serving up nice pages with content, but as soon as you try to login, it doesnt work anymore, just keeps taking you back to the login page, no error messages, nothing.

Register gives the error: The requested URL /wishlist-member/ was not found on this server.

PhpMyAdmin seems to work, but I cannot figure out if I can use that to fix the problem either. I tried creating “new server” in PhpMyAdmin, but when I logged in next, this had disappeared.

Any help at this point would be highly appreciated.