phpmyadmin after logins redirects to wrong url

Hello,
nginx + phpmyadmin based on howtoforge.com/tutorial/perfect-server-debian-9-nginx-bind-dovecot-ispconfig-3.1/2/#-install-phpmyadmin tutorial. After I visit some.site.url/phpmyadmin and I login I get 404 error with this url:
some.site.url/index.php?token=94f2c3e0aedaff223dc2306ee1bac2d1
After I delete "index.php?token=94f2c3e0aedaff223dc2306ee1bac2d1" and write phpmyadmin by hand in the url "some.site.url/phpmyadmin" - phpmyadmin site is oppened normaly

When I want to logout, url looks like: some.site.url/phpmyadmin/logout.php?db=&token=94f2c3e0aedaff223dc2306ee1bac2d1
When I logout I get 404 error and pointed to "some.site.url/index.php" but not "some.site.url/phpmyadmin"

How to fix this?

 

Same here with this tutotrial: perfect-server-ubuntu-18-04-nginx-bind-dovecot-and-ispconfig-3
Ubuntu 18.04 / Nginx
After applying options in Nginx
location /phpmyadmin {
.../...
}
as shown in the tutorial, it connects well on https:// some.site.url/phpmyadmin
BUT: when logging, it shows an "ERROR 404 - Not found" as it connects to : https:// some.site.url/index.php?token=xxxxxxxxxxxxxxxxxxx
Obviously, it's wrong cause it should connect to https:// some.site.url/phpmyadmin/index.php?token=xxxxxxxxxxxxxxxxxxx
I guess it's a redirection problem in Nginx options?!!
How to fix it ?
Thanx.