Memory not reading correctly by wordpress

Hi
I have updated the memory limit to 2048M in the wp-config.php file and also this is displyaing 2048M in then phpinfo.php files but when trying to login into admin, I am getting the following error: Allowed memory size of 262144 bytes exhausted (tried to allocate 12288 bytes) in

I checked the ini_set memory to 2048M
setup a php.ini file for 2048M memory limit

but still showing the 256M memory limit. I can’t even access the admin so that I can login and disable all plugins but unable to access the admin panel at all. I tried renaming all plugins, theme, etc but unable to login into admin as this memory error remains there.

Fatal error: Allowed memory size of 262144 bytes exhausted (tried to allocate 12288 bytes) in /home/username/public_html/wp-includes/functions.php on line 1794

Any help to get in the admin panel is highly appreciated thanks